In " The Radar Book - Effective Navigation and Collision Avoidance " by
Kevin Monahan, he points out that the compass bearing given by a GPS will be
unstable at low speeds. If you want your radar to show proper compass
bearings and work in the North-up/Course-up modes he says you must connect
to some type of fluxgate or gyro compass. So if you just connect your GPS
NMEA output to your radar it seems you may not get correct heading
information while creeping along at low speed, for example, in fog.

"Gary" wrote in message
...
I saw a few people said something about needing a fluxgate compass. I also
have a Robertson AP3000X autopilot that is connected to a fluxgate
compass.
Am I going to need 3 cables now, or is the GPS most likely connected to
the
fluxgate compass already?


"Gary" wrote in message
. ..
I recently bought a 1995 320 Albemarle Express Fisherman. It has a
Furuno
1830 Radar and a Garmin 220 GPS. In reading through the manuals for
these
pieces of equipment, I have noticed that it's possible to connect a GPS
to
the radar and it will display some nav information on the Radar unit as
well
as having the ability to plot the speed and direction of various targets
on
the radar.

Is this simply a matter of purchasing and attaching some sort of cord
between the units, and if so, where do I get this? I am not sure if they
are fairly universal or do I need to contact one of the vendors for this,
and if so, which one...Furuno or Garmin?

Is there more to it than this? Any idea how much it costs?

Thanks!

Gary

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