Depth sounders - Page 2 - SailNet Community
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post #11 of 16 Old 03-09-2012
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Re: Depth sounders

Thanks, johnharch,
I think you're right. The PSC hull shape probably dictates the transducer placement. On other, flatter-hulled boats, it can go towards the bow. In any case, I agree: I really don't have to worry about its placement as our waters are plenty deep. Also, I've always thought that I'd have to be going forward VERY slowly for the "advance warning" of a forward-placed transducer to allow me to react in time to avoid a grounding.

Fair winds

Elena
s/v Nanook
Pacific Seacraft 37
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post #12 of 16 Old 03-09-2012
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Re: Depth sounders

Carry a spare , when cruising the South Pacific. Mine screwed up down there and I had to sail home without one. Not so readily available down there, and super cheap up here.

Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"
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post #13 of 16 Old 07-08-2012
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Re: Depth sounders

I have a IS15 depth sounder that seems to want to come on only after it has been turned on and off a couple of times. The folks who make the transducer says they either work or don't work and I probally have a cable issue. Has anyone else experienced this
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post #14 of 16 Old 07-08-2012 Thread Starter
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Re: Depth sounders

I don't know if we have the same issue or not. Mine was erratic on when it worked or not particularly in shallow water. I finally concluded, right or wrong, that it was because the transducer was installed with way too much deadrise causing the usable signal to be very weak.

I installed a new shoot through the hull P79 smart transducer under the foot well under the chart table. It works like a charm and gives consistent readings up to six or seven hundred feet.
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post #15 of 16 Old 07-08-2012
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Re: Depth sounders

Was this an Simrad IS15 depth finder and if so where did you get the transducer.
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post #16 of 16 Old 07-08-2012 Thread Starter
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Re: Depth sounders

Well now this gets complicated. I believe the vast majority of transducers are manufactured by Airmar. I got a generic Airmar p79 from a local marine electronics store.
AIRMAR Electronic Catalog
The P79 comes in two basic versions, a NMEA 2000 or a NMEA 0183.
My is15 instruments are connected through an AT15 to a Simnet bus which is basically a NMEA 2000 bus with different cable connectors so I got the NMEA 2000 version and plugged it into the bus.

You probably don't have the Simnet bus, so you would get the 0183 version and then plug the output into the NMEA 0183 jack on the back of your IS15 display head. When you turn off the IS15 depth sounder it will then display the depth data that is coming over the NMEA network from your new tranducer.

It is not a plug and play solution, but is not really too complicated if you have a grasp of the networking. You will need to do some wire splicing to get the output from the transducer into a plug that fits the jack on the back of the display unit and you will need to supply power to the transducer.

Here is a link to one site that sells the transducer.
NMEA 0183 P79 Transducer P79-235-0 | Blue Heron Marine Electronics
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