What is the purpose of this black box I found and why was it installed? The insides are obviously Raymarine
brand even though there are no names or other identifying things on the outside.
I ran across it while cleaning
up a poor wiring installation
done by the previous owner of my boat. All my instruments are Raymarine
with the exception of the GPS/chartplotter which I'm replacing with a Garmin
(Whooeee is it a nice unit!)
This mysterious box was hooked up such that it constantly drew battery
power, but as far as I can tell it wasn't doing anything. There are 3 wire bundles coming out of it. One is a 3 terminal Seatalk
wire, and the other two have been cut off about 6 inches out of the box and redone with after market wire. One of those is hand labeled DATA and another is hand labeled POWER.
I traced the Power lead which had been connected to the house battery
, and the Data leads went to the autopilot
and also to the GPS NMEA
The inside of the box contains a Raymarine circuit board with several computer microprocessor chips, a crystal labeled 12.0 for the processor clock, a 5 volt regulator
and a few other integrated circuits as well.
One of the microprocessors has a V 05 label on it and a sticker on another chip says
Another chip is labeled
The circuit board itself has a number etched on it.
3015-053 A NAVDATA
I suspect it is either a Seatalk
to NMEA 0183
converter or NMEA 0183
to Seatalk, but I'm not sure. All my Raymarine instruments work normally without this box.
As I am in the process of installing a chartplotter
which needs NMEA
1083 or NMEA 2000
, it would be great if I could read the Seatalk information on the plotter.
Thanks for your help!