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.
Thought about this some more and maybe this is a better answer.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.
Thanks. That confirms my admittedly limited N2K experience.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.
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?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.
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 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.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 #.
Yes a converter box works but it is indeed a kludge.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.
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.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.
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.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.
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.
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.Still really frustrating. The only place I've found online that sells the Airmar st800 is here:
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?