Raymarine made a multifunction display which uses the sea talk bus.

If you could get one of these off ebay and also a nema to seatalk converter
this would seem to meet the requirement

Alec



"Daniele Fua" wrote in message
. ..
Is there an easy way to build a display that will show some chosen NMEA
data?
I have seen on the market programmable units that sell for several hundred
$ and I know that a computer is easily interfaced but what I need is just
a simple, cheap and weatherproof repeater at the helm to display only few
of the zillion data available at the underdeck main navigation station.
For example decoding just part of BWC and VTG and displaying, say, four
lines would be enough (COG, heading, bearing to waypoint, and distance to
waypoint).

Daniel