[C320-list] Speed paddle transducer & NMEA 2000

[Scott Thompson]

My understanding is that with the older Raymarine setup the transducer 
itself and its cable are analog, and are neither Seatalk nor NMEA. 
(Possibly newer installations are digital.) Rather they are a fairly 
standard type of analog sensor not manufactured by Raymarine itself. I 
believe Raymarine was using Airmar transducers when I replaced upgraded 
my speed sensor a few years back. The Raymarine speed display takes the 
analog reading from this cable and converts it to digital SeaTalk format 
for communication with other devices. The transducer itself is probably 
compatible with display heads from other manufacturers. In any event, 
you can probably find a drop in replacement at relatively low cost. The 
trick is to find one that fits the existing thruhull.

I agree with what other people have said about the value in a complete 
electronics overhaul on an older boat, and the need to plan it 
carefully. I stuck with Raymarine / Seatalk when I did a major 
electronics upgrade a few years back. However I think that is an 
independent decision from how you address the transducer failure.

Scott Thompson
Surprise, #653

On 7/21/2017 7:53 AM, Mark Gillingham wrote:
> When I attempted to pull my speed transducer only half of it came out. I
> couldn't fish the paddle end out so closed the fitting up again. I assume
> this can't be repaired and I must replace it.
>
> A couple of questions. Is this Seatalk transducer compatible with more
> modern ones that are easily purchased or do I need to find an old one?
>
> I have a hybrid network of Seatalk and NMEA 2000 and they are not
> merged—completely separate. Should I use this as an opportunity to get
> other 2000 transducers?
>
> Mark
> Speakeasy #612
> St Joseph MI/ Chicago
>
>