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-   -   For Pete's sake! I just want a speed transducer! (https://www.sailnet.com/forums/electronics/315114-petes-sake-i-just-want-speed-transducer.html)

BillMoran 03-26-2018 06:16 AM

For Pete's sake! I just want a speed transducer!
 
What I'm looking for is a thru-hull speed transducer that will send data onto an NMEA 2000 network so all my instruments can use it. Preferably it would 1.25" diameter to fit in the hole from the old (no longer functioning) device.

On the surface, if anyone can point me to a model that fits that need, I'd be eternally grateful.

On a deeper level, I'm wondering if it's just me, or is it insanely difficult to find information about this stuff? Looking at the advertisements, they say nothing about mounting dimensions or even the data technology in use. Especially with the data technology, it's frequently some proprietary protocol that may or may not be NMEA 2000 compatible.

Maybe I'm just impatient or really bad at research ... but it feels like I spend an inordinate amount of time trying to find out important bits of information about the equipment I'm considering buying. Is it just me?

colemj 03-26-2018 07:04 AM

Re: For Pete's sake! I just want a speed transducer!
 
Airmar makes them for pretty much all manufacturer brands. You will want the ST800 or ST850: http://www.airmar.com/uploads/Brochures/st800.pdf

Mark

svHyLyte 03-26-2018 09:31 AM

Re: For Pete's sake! I just want a speed transducer!
 
Or... see Airmar

FloridaBoy 03-26-2018 10:13 AM

Re: For Pete's sake! I just want a speed transducer!
 
It's not you Bill. I just purchased a Raymarine BiData I40, speed wheel and temp for the port side and depth finder for the starboard. Both to replace aged Datamarine stuff. I had a heck of a time finding info on the Raymarine site. I had to find the manuals on line and read those for pertinent information. Like, size of the hole, 2 inches in my case, which was perfect. And no where did it say the speed wheel came with a plug, or how long the cords were, in any ad. I finally went to a local Raymarine Dude, here in Cocoa and he let me know what was going on. After that, it was simple Got the Bidata set up for 420 bucks, out the door. sweet. Can't say for sure if it will hook up to the NEMA stuff, but I do remember asking him if it would and he said sure, it would. kevin

FloridaBoy 03-26-2018 10:15 AM

Re: For Pete's sake! I just want a speed transducer!
 
And HyLyte is correct. Raymarine transducers are made by Airmar. Gotta look for their manuals, as well, to get any info. Kevin

BillMoran 03-26-2018 10:41 AM

Re: For Pete's sake! I just want a speed transducer!
 
Still really frustrating. The only place I've found online that sells the Airmar st800 is here:
http://www.imarineusa.com/AirmarST80...iABEgJOp_D_BwE

However, even though colemj's link claims it's an NMEA2000 device. That vendor claims it has spade connectors for Raymarine gauges. I suppose it's possible that I could just replace the end of the wire with an NMEA2000 connector and it would work?

FloridaBoy 03-26-2018 10:45 AM

Re: For Pete's sake! I just want a speed transducer!
 
Here, Call this guy. Marine electronics for 40 yrs. Does all the tugs, ships, whatever, down here. Been to my boat a couple of times. He is component certified, which means he can replace transistors and such on a board. Great guy. Give him a call and he will help you out, I am sure. Zach Duys, as in boyz. 321-302-6158 kevin

colemj 03-26-2018 11:15 AM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by BillMoran (Post 2051437106)
Still really frustrating. The only place I've found online that sells the Airmar st800 is here:
http://www.imarineusa.com/AirmarST80...iABEgJOp_D_BwE

However, even though colemj's link claims it's an NMEA2000 device. That vendor claims it has spade connectors for Raymarine gauges. I suppose it's possible that I could just replace the end of the wire with an NMEA2000 connector and it would work?

Airmar doesn't sell direct. Contact Gemeco https://www.gemeco.com and tell them what you need. They will tell you where to buy it.

We bought one this way, and it is definitely NMEA2000 with a canbus connector.

Mark

Jeff_H 03-26-2018 11:29 AM

Re: For Pete's sake! I just want a speed transducer!
 
Knotmeter transducers do not send NMEA information. They either send an electrical pulse or voltage reading. The Display head or 'black box' takes that pulse frequency or voltage, crunches the numbers and converts that to useful data such as a read out on an instrument or a NMEA sentence. Some of the newer systems use a 'smart transducer' but those do not work with older equipment.

Since different manufacturers, or even different models of equipment from the same manufacturer use different transducers which produce different pulse rates or voltages, its extremely difficult to find alternate transducers for any given display head, even if you do know the transducer manufacturer.

One of the things which has happened with great frequency is that the design of transducers has changed over time. Manufacturers claim that these changes have resulted in more reliability or better functionality. So with every new upgrade to the display heads, the transducers seem to change as well. But with each change, the transducer in your hull and possibly thru-hull in your boat, will no longer be correct for the replacement black box or display head.

My best suggestion would be to start with the company that made your display head. Find out what the input characteristics need to be to work properly with by your instruments. Failing that, find out the specific model number for the transducer that was used by your display. Once you have that information, Airmar (or who ever made your transducer) should be able to tell you whether they have other transducers with the output characteristics of the specific transducer that you are replacing.

Jeff

Noelex 03-26-2018 12:17 PM

Re: For Pete's sake! I just want a speed transducer!
 
As Mark has said the Airmar DST800 is the most popular choice. A number of companies sell this transducer such as Simrad:

https://www.simrad-yachting.com/simr...5khz-f57ab51d/

Garmin also produce an adaptor that converts some standard transucers into one that will transmit NMEA2000 messages. I think they sell the black box with or without the transducer

https://buy.garmin.com/en-US/US/p/26510

MarkSF 03-26-2018 12:33 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by Noelex (Post 2051437202)
As Mark has said the Airmar DST800 is the most popular choice. A number of companies sell this transducer such as Simrad:

https://www.simrad-yachting.com/simr...5khz-f57ab51d/

Garmin also produce an adaptor that converts some standard transucers into one that will transmit NMEA2000 messages. I think they sell the black box with or without the transducer

https://buy.garmin.com/en-US/US/p/26510

Yes, I have the DST800 myself. Works fine. I get depth, speed, and temp on the NMEA 2000 network.

I wouldn't bother searching out an ST800, why not have the depth as well? Even if you already have depth, a backup would not hurt.

Please note that it's available in NMEA 0183, and NMEA 2000 versions. Obviously, you want the latter.

The ST 800 is available in analogue, and NMEA 2000 versions.

MarkSF 03-26-2018 12:39 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by BillMoran (Post 2051437106)
Still really frustrating. The only place I've found online that sells the Airmar st800 is here:
http://www.imarineusa.com/AirmarST80...iABEgJOp_D_BwE

However, even though colemj's link claims it's an NMEA2000 device. That vendor claims it has spade connectors for Raymarine gauges. I suppose it's possible that I could just replace the end of the wire with an NMEA2000 connector and it would work?

See above. That one is the analog version.

colemj 03-26-2018 01:08 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by Jeff_H (Post 2051437170)
Knotmeter transducers do not send NMEA information. They either send an electrical pulse or voltage reading. The Display head or 'black box' takes that pulse frequency or voltage, crunches the numbers and converts that to useful data such as a read out on an instrument or a NMEA sentence. Some of the newer systems use a 'smart transducer' but those do not work with older equipment.

Since different manufacturers, or even different models of equipment from the same manufacturer use different transducers which produce different pulse rates or voltages, its extremely difficult to find alternate transducers for any given display head, even if you do know the transducer manufacturer.

One of the things which has happened with great frequency is that the design of transducers has changed over time. Manufacturers claim that these changes have resulted in more reliability or better functionality. So with every new upgrade to the display heads, the transducers seem to change as well. But with each change, the transducer in your hull and possibly thru-hull in your boat, will no longer be correct for the replacement black box or display head.

My best suggestion would be to start with the company that made your display head. Find out what the input characteristics need to be to work properly with by your instruments. Failing that, find out the specific model number for the transducer that was used by your display. Once you have that information, Airmar (or who ever made your transducer) should be able to tell you whether they have other transducers with the output characteristics of the specific transducer that you are replacing.

Jeff

The OP stated that he needs NMEA2000 output, which the Airmar smart transducers produce directly from the unit. No black box required - the physical connector from the transducer is a standard canbus cable and connector.

Pretty much all equipment sold today is standard NMEA2000, and all the transducers are the same. Transducer differences are in housing size, type, and desired frequency, but the work with all equipment. An exception is Raymarine, which uses non-standard connectors and separate black boxes. Just stay away from Raymarine, and all is good.

Display heads are no longer dedicated to the depth transducer. Most now are multi-function displays that simply read network data.

Different transducer pulse rates are standardized and exist for depth resolutions. One has a choice of frequencies when choosing a transducer, and some are dual frequency. Again, this will all be readable by any current MFD display.

Mark

colemj 03-26-2018 01:11 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by Noelex (Post 2051437202)
As Mark has said the Airmar DST800 is the most popular choice. A number of companies sell this transducer such as Simrad:

https://www.simrad-yachting.com/simr...5khz-f57ab51d/

Garmin also produce an adaptor that converts some standard transucers into one that will transmit NMEA2000 messages. I think they sell the black box with or without the transducer

https://buy.garmin.com/en-US/US/p/26510

Actually, I pointed out the ST800 or ST850, not the DST models. These are only speed and temp - no depth. While it seems to be a good thing to also get depth with the DST models, they have a poor reputation for early failure. Also, they do not come in tilted element versions to accommodate deadrise if that is important.

Mark

overbored 03-26-2018 01:11 PM

Re: For Pete's sake! I just want a speed transducer!
 
Airman does make a speed sensor that comes with a MMEA 2000 output direct form the sensor. I had one but I replaced the paddle wheel sensor with a CS4500 ultra sonic which has NMEA output. no more cleaning of the paddle wheel. always reads correctly. Call Gemeco they are very helpful

peterlsmith 03-26-2018 03:10 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by BillMoran (Post 2051436874)
What I'm looking for is a thru-hull speed transducer that will send data onto an NMEA 2000 network so all my instruments can use it. Preferably it would 1.25" diameter to fit in the hole from the old (no longer functioning) device.

On the surface, if anyone can point me to a model that fits that need, I'd be eternally grateful.

On a deeper level, I'm wondering if it's just me, or is it insanely difficult to find information about this stuff? Looking at the advertisements, they say nothing about mounting dimensions or even the data technology in use. Especially with the data technology, it's frequently some proprietary protocol that may or may not be NMEA 2000 compatible.

Maybe I'm just impatient or really bad at research ... but it feels like I spend an inordinate amount of time trying to find out important bits of information about the equipment I'm considering buying. Is it just me?

Rest assured it is not just you - I went through the same process a month ago. I had a failed speed transducer (an old Stowe) and wanted to replace it with an N2K unit. Ultimately I went an Airmar ST800 unit, but even the options here are confusing. You have the ST800 and the ST850. The difference between the two being that the ST800 has a flapper valve built into the thru-hull, while the 850 I believe has an additional sleeve with the valve. I honestly couldn't tell the benefits of either one, so I just tossed a coin and went for the ST800.
However, each version has a choice of thru-hull materials - plastic or bronze for the ST800, plastic, bronze, or SS for the ST800. Just to add further confusion, Airmar produces branded versions with different connectors. The model number of the one I have is ST800PV-N2 - this is the plain (unbranded) Airmar plastic housing N2K version with a standard N2K connector - plugs straight into my N2K network and was picked up automatically by my chart-plotter, no fiddling needed.

Note that all versions require a 2" hole, so you will need to enlarge the old thru-hull. I just drilled out the old one - nice and simple even for a newbie like me. At least I think so - I'll let you know if she sinks when she's dunked in a week!

skipmac 03-26-2018 04:10 PM

Re: For Pete's sake! I just want a speed transducer!
 
Maybe I missed it but haven't seen what to me is the most obvious, easy solution.

If you get a transducer that plugs into whatever MFD or plotter you use AND that display is connected to the NMEA2000 network then all other devices on the network will have access to the data from the transducer.

peterlsmith 03-26-2018 04:42 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by skipmac (Post 2051437570)
Maybe I missed it but haven't seen what to me is the most obvious, easy solution.

If you get a transducer that plugs into whatever MFD or plotter you use AND that display is connected to the NMEA2000 network then all other devices on the network will have access to the data from the transducer.

I'm not ware of any chartplotters that will transmit data on to the network like this. Generally you have N2K enabled devices such as depth/speed transducers, air temperature/pressure sensors, wind instruments, etc, which connect to the NMEA2000 network and transmit data. Then you have other N2K enabled devices such as chartplotters or data display units that connect to the network and read data from it to display.

For what it's worth, I'm a new to this N2K network, but I like it. I installed a N2K network running from the V berth to the cockpit. Both my depth and speed transducers were defunct, so I replaced them both with Airmar units. These are very low power devices and plug straight into the network in the V berth - no additional power leads or transducer boxes. The chartplotter automatically picks up the data - it was literally plug and play. I also added air temperature/humidity and pressure sensors, and again these just plug into the network and are picked up in the environmental data display on the chartplotter. All these devices (chartplotter excluded) use less than half an amp, but the real benefit to me was being able to throw out a whole load of old wiring and transducer black boxes.

skipmac 03-26-2018 05:15 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by peterlsmith (Post 2051437626)
I'm not ware of any chartplotters that will transmit data on to the network like this. Generally you have N2K enabled devices such as depth/speed transducers, air temperature/pressure sensors, wind instruments, etc, which connect to the NMEA2000 network and transmit data. Then you have other N2K enabled devices such as chartplotters or data display units that connect to the network and read data from it to display.

For what it's worth, I'm a new to this N2K network, but I like it. I installed a N2K network running from the V berth to the cockpit. Both my depth and speed transducers were defunct, so I replaced them both with Airmar units. These are very low power devices and plug straight into the network in the V berth - no additional power leads or transducer boxes. The chartplotter automatically picks up the data - it was literally plug and play. I also added air temperature/humidity and pressure sensors, and again these just plug into the network and are picked up in the environmental data display on the chartplotter. All these devices (chartplotter excluded) use less than half an amp, but the real benefit to me was being able to throw out a whole load of old wiring and transducer black boxes.

I'm pretty new to N2K myself but am learning. Here's what I have installed.

Garmin 740s plotter (upgrading to a 942sx), Simrad AP including rudder angle sensor, compass, brain and controller and my old Raymarine Seatalk Bidata40 speed and depth.

I installed a Raymarine box that converts Seatalk to SeatalkNG which is N2K compatible except for the plugs so add an adapter cable. Now my Garmin plotter gets heading info from the Simrad AP compass. I can set a waypoint on the Garmin and the Simrad will steer to it. The Garmin shows speed and depth from the Raymarine and the Simrad AP also sees the Raymarine speed.

So as far as I can tell, anything on an N2K network is available to anything else on the same network.

colemj 03-26-2018 05:32 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by peterlsmith (Post 2051437506)
Rest assured it is not just you - I went through the same process a month ago. I had a failed speed transducer (an old Stowe) and wanted to replace it with an N2K unit. Ultimately I went an Airmar ST800 unit, but even the options here are confusing. You have the ST800 and the ST850. The difference between the two being that the ST800 has a flapper valve built into the thru-hull, while the 850 I believe has an additional sleeve with the valve. I honestly couldn't tell the benefits of either one, so I just tossed a coin and went for the ST800.
However, each version has a choice of thru-hull materials - plastic or bronze for the ST800, plastic, bronze, or SS for the ST800. Just to add further confusion, Airmar produces branded versions with different connectors. The model number of the one I have is ST800PV-N2 - this is the plain (unbranded) Airmar plastic housing N2K version with a standard N2K connector - plugs straight into my N2K network and was picked up automatically by my chart-plotter, no fiddling needed.

Note that all versions require a 2" hole, so you will need to enlarge the old thru-hull. I just drilled out the old one - nice and simple even for a newbie like me. At least I think so - I'll let you know if she sinks when she's dunked in a week!

The only difference between the ST800 and ST850 is the size - the ST800 is a little longer. There are two of them because there were two historic sizes of housings, so they have one for each size. Then, like you point out, you can get each with plastic, SS, or bronze housings, etc.

As to whether the thruhull needs to be drilled larger, that depends on what you are replacing. Reasonably old Airmar transducers have use the 2" thruhull size for at least 20yrs, and probably longer. If replacing an old Data Marine or similar, then those were different sizes.

Mark

outbound 03-26-2018 06:31 PM

Re: For Pete's sake! I just want a speed transducer!
 
Has an Airmar ultrasonic Speedo put in originally. Total piece of junk although a great idea as there are no spinning paddles. Replaced it twice in as many years. Flipped to the 800,and fine since.

RegisteredUser 03-26-2018 06:43 PM

Re: For Pete's sake! I just want a speed transducer!
 
You could also leave the old one in (and forget about it) and install a shoot-thru-hull transducer in another location.
You can find solid glass w/o core.
Installation is dry and fairly easy....no hole.

colemj 03-27-2018 07:00 AM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by RegisteredUser (Post 2051437794)
You could also leave the old one in (and forget about it) and install a shoot-thru-hull transducer in another location.
You can find solid glass w/o core.
Installation is dry and fairly easy....no hole.

He's looking for a speed transducer, not depth.

Mark

skipmac 03-27-2018 10:08 AM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by peterlsmith (Post 2051437626)
I'm not ware of any chartplotters that will transmit data on to the network like this. Generally you have N2K enabled devices such as depth/speed transducers, air temperature/pressure sensors, wind instruments, etc, which connect to the NMEA2000 network and transmit data. Then you have other N2K enabled devices such as chartplotters or data display units that connect to the network and read data from it to display.

Thought about this some more and maybe this is a better answer.

On an N2K network there are some devices that generate and transmit data like fathometer, wind, speed, etc. These cannot receive anything as they are dumb transmitters and don't need any other data anyway.

Then there are devices that receive data like chart plotters, AP brains, etc. but are smart devices and can also transmit data like a plotter sending waypoints to an AP brain. This I have verified with my setup.

So once a device that can send/receive data is connected to the network I believe all the information that device has is then available on the network for any other device that can receive it.

Another example, my Simrad AP compass is a dumb device that transmits only but the data from the compass is received and used by my Garmin plotter and the Simrad AP computer.

colemj 03-27-2018 12:17 PM

Re: For Pete's sake! I just want a speed transducer!
 
All N2K enabled chartplotters I am aware of can also retransmit received N2K data on a network (or onto another separate network). So can other devices such as some AIS transponders, small MFD's, etc. Many are also NMEA200-NMEA0183 translators. Some even retransmit and translate over wifi.

There is no need for the transducer to plug directly into anything - just connect it to the network backbone at the most convenient place. This avoids the need to retransmit any data, unless one wishes to bridge to another network.

Mark

skipmac 03-27-2018 03:00 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by colemj (Post 2051438458)
All N2K enabled chartplotters I am aware of can also retransmit received N2K data on a network (or onto another separate network). So can other devices such as some AIS transponders, small MFD's, etc. Many are also NMEA200-NMEA0183 translators. Some even retransmit and translate over wifi.

Thanks. That confirms my admittedly limited N2K experience.


Quote:

Originally Posted by colemj (Post 2051438458)
There is no need for the transducer to plug directly into anything - just connect it to the network backbone at the most convenient place. This avoids the need to retransmit any data, unless one wishes to bridge to another network.

Mark

Assuming an N2K transducer. In my case my transducers (speed and depth) are not and have to plug into the Raymarine Bidata display. I believe that was also the case with my old Garmin. So in that case the transducer(s) would have to plug first to the plotter or MFD which would then have that data on the backbone. Yes?

Maine Sail 03-27-2018 03:35 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by BillMoran (Post 2051436874)
What I'm looking for is a thru-hull speed transducer that will send data onto an NMEA 2000 network so all my instruments can use it. Preferably it would 1.25" diameter to fit in the hole from the old (no longer functioning) device.

On the surface, if anyone can point me to a model that fits that need, I'd be eternally grateful.

On a deeper level, I'm wondering if it's just me, or is it insanely difficult to find information about this stuff? Looking at the advertisements, they say nothing about mounting dimensions or even the data technology in use. Especially with the data technology, it's frequently some proprietary protocol that may or may not be NMEA 2000 compatible.

Maybe I'm just impatient or really bad at research ... but it feels like I spend an inordinate amount of time trying to find out important bits of information about the equipment I'm considering buying. Is it just me?


If you don't want to replace the thru-hull fitting then you'll really need to know what is on the label/tag at the transducer end of the cable in terms of model/part #.

With this data you can then go through any legitimate marine electronics dealer/installer who has a Gemeco account, and order the correct transducer to fit in that thru-hull.

The current Gemeco catalog is 671 pages long so without the correct part numbers you're shooting at darts blind folded. Gemeco is the wholesale/distribution arm of Airmar.

RegisteredUser 03-27-2018 03:36 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by colemj (Post 2051438170)
He's looking for a speed transducer, not depth.

Mark

Yeah...missed that part...:)

If the OP is GPS'd up, I wouldn't feel the need for a speed transducer.

colemj 03-27-2018 04:41 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by Maine Sail (Post 2051438666)
If you don't want to replace the thru-hull fitting then you'll really need to know what is on the label/tag at the transducer end of the cable in terms of model/part #.

If he wants a transducer that directly produces NMEA2000 output, then there are only three choices (ST800, ST850, DST800), and none will fit a 1.25" thruhull. It may be possible to use a non-N2K transducer connected to a converter box of some sort, but that seems a kludge way of doing it.

Edit: 4 choices counting the ultrasonic transducer.

Mark

skipmac 03-27-2018 07:06 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by colemj (Post 2051438738)
If he wants a transducer that directly produces NMEA2000 output, then there are only three choices (ST800, ST850, DST800), and none will fit a 1.25" thruhull. It may be possible to use a non-N2K transducer connected to a converter box of some sort, but that seems a kludge way of doing it.

Mark

Yes a converter box works but it is indeed a kludge.

Since I installed new speed and depth transducers not that long ago that work fine I didn't want to toss them, so got a box that connected them to my network. A lot cheaper and I didn't have to spend hours feeding wires through inaccessible parts of my bilge.

colemj 03-27-2018 07:55 PM

Re: For Pete's sake! I just want a speed transducer!
 
In the case of Raymarine, I think even their newer transducers require a converter box to use them, so you wouldn't gain any simplicity by getting new ones. If you were to install a standard N2K transducer, you would need a N2K to SeatalkNG converter/cable to put in on a standard N2K network, because Raymarine refuses to use industry standard connectors.

But I didn't mean to comment on your choice and reasons - I was responding to the OP's desire to put a N2K transducer directly on his existing network. In his case, buying a new non-N2K transducer plus a converter box seems more trouble than just enlarging his thruhull to take the N2K transducer directly.

Mark

skipmac 03-27-2018 09:03 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by colemj (Post 2051438930)
In the case of Raymarine, I think even their newer transducers require a converter box to use them, so you wouldn't gain any simplicity by getting new ones. If you were to install a standard N2K transducer, you would need a N2K to SeatalkNG converter/cable to put in on a standard N2K network, because Raymarine refuses to use industry standard connectors.

If I purchase new transducers I definitely will not go with Raymarine. Either an N2K transducer or one that connects directly to my Garmin or Simrad.

As far as I can tell and according to Raymarine techs SeatalkNG is 100% N2K compatible at least in the software and communications protocols but they do use proprietary connectors which I find pointless and annoying. Sure it only takes a cable with Ray to standard connectors but still.

Quote:

Originally Posted by colemj (Post 2051438930)
But I didn't mean to comment on your choice and reasons - I was responding to the OP's desire to put a N2K transducer directly on his existing network. In his case, buying a new non-N2K transducer plus a converter box seems more trouble than just enlarging his thruhull to take the N2K transducer directly.

Mark

Didn't really consider whether you were commenting specifically on my choice or the technique in general but I considered it a kludge from the getgo so not to worry, we're on the same page with that.

It was my first foray into N2K but it added a lot to the learning curve to figure how to get the Raymarine integrated into the rest. All the Garmin and Simrad stuff was 100% standard cable, plug and play. Yes my Ray stuff was previous generation but even new generation takes some messing about to connect.

Don't recall what setup the OP has for plotters but if his existing setup has a transducer connected to a plotter or he can get a cheaper transducer for an existing plotter that is N2K then that could be a cheap and easy solution.

BarryL 03-28-2018 01:24 PM

SONAR vs DEPTH
 
Hey,

As far as I know, if you want a SONAR display instead of just depth, you can't use a N2K transducer. The only way to get SONAR data is by connecting the transducer to the plotter / black box / etc.

If you do this, most likely the MFD will put DEPTH information onto the N2K network so the depth can be displayed by other devices. But if you want to see the bottom, or find fish or anything else like that you can only do it at the MFD.

Barry


Quote:

Originally Posted by skipmac (Post 2051439042)
If I purchase new transducers I definitely will not go with Raymarine. Either an N2K transducer or one that connects directly to my Garmin or Simrad.

As far as I can tell and according to Raymarine techs SeatalkNG is 100% N2K compatible at least in the software and communications protocols but they do use proprietary connectors which I find pointless and annoying. Sure it only takes a cable with Ray to standard connectors but still.



Didn't really consider whether you were commenting specifically on my choice or the technique in general but I considered it a kludge from the getgo so not to worry, we're on the same page with that.

It was my first foray into N2K but it added a lot to the learning curve to figure how to get the Raymarine integrated into the rest. All the Garmin and Simrad stuff was 100% standard cable, plug and play. Yes my Ray stuff was previous generation but even new generation takes some messing about to connect.

Don't recall what setup the OP has for plotters but if his existing setup has a transducer connected to a plotter or he can get a cheaper transducer for an existing plotter that is N2K then that could be a cheap and easy solution.


BillMoran 04-01-2018 07:18 PM

Re: For Pete's sake! I just want a speed transducer!
 
Thanks to everyone for the info.

I ended up ordering an Airmar branded ST-800. It arrived the other day and does, indeed, have a N2K Micro connector on it ... so it should plug right in.

It _looks_ like it is the right size for the existing thru-hull ... I'll know for sure when I visit the boat this coming weekend to work on it.

colemj 04-02-2018 09:47 AM

Re: For Pete's sake! I just want a speed transducer!
 
If it "looks" the right size, then it will fit. These transducers only came in a couple of diameters, and they are very obviously different.

Your only issue may be with a locating tab on them. When we replaced ours, the new transducer came with a small tab moulded into it which served to locate the transducer so that it faced forward. When used with its corresponding thruhull, that also had a tab recess on its top lip to match. I wanted to use our old thruhull, so I just filed a small tab recess into the top lip and everything worked fine.

Mark

KeelMe 04-13-2018 11:57 PM

Re: For Pete's sake! I just want a speed transducer!
 
Quote:

Originally Posted by BillMoran (Post 2051437106)
Still really frustrating. The only place I've found online that sells the Airmar st800 is here:
http://www.imarineusa.com/AirmarST80...iABEgJOp_D_BwE

However, even though colemj's link claims it's an NMEA2000 device. That vendor claims it has spade connectors for Raymarine gauges. I suppose it's possible that I could just replace the end of the wire with an NMEA2000 connector and it would work?

Airmar isn't good at detailing the specifications of their products. They make the ST800 in about 10 different flavors but they are all the ST800. For sub $100 this one mentioned is definitely not an NMEA 2000 version but there are plenty of ST800 that are NMEA 2000. Here is one that is SeatalkNG (NMEA 2000) and here is one that is analog.

95% of the transducers available are 2".

Simrad and Furuno both sell the ST800 with the NMEA 2000 micro-c plug.

BillMoran 04-14-2018 06:57 AM

Re: For Pete's sake! I just want a speed transducer!
 
Just to follow up ... I was at the boat last weekend and no only does the Airmar fit, but it's literally a drop-in replacement for the previous one size-wise.

So, despite my frustration, that worked out.


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