"Ric" wrote in message
...
Like Steve below, I need to get HDM into my Furuno radar. Can I take this
direct from my fluxgate compass? Does anybody know if the Rayamrin
fluxgate
compass output their data in raw NMEA, or is it an analogue signal which
is
then interepreted into NMEA by the Autohelm?


The flux compass sensor output is not NMEA. It is unique to flux compasses
sensors. Autohelm doesn't say what the designation of each signal wire is.
(just "match the wire color to the color of the connector spade'' or words
to that effect.)

However, for future reference, my SiTex manual provides the following signal
designation:

1. 90 deg Signal (pulse)
2. 0 deg Signal (pulse)
3. S1 Signal (pulse)
4. S2 Signal (pulse)
5. Bearing Signal
6. Power (+B)
7. Power (GND)

If you want the magnetic flux compass heading, you should be able to get
that off the ST buss by converting it back to NMEA (Z137 interface). But the
cost of doing that will be as much as a cheap Flux Gate compass.

Obviously I don't know about which I speak, since I still haven't resolved
my own problems.

Steve
s/v Good Intentions