autopilot wrote:
Hi Meindert

The multiplexer is 42 BT

The ps is secondary navigation for AIS and night time use / back up, I
want to be able to click on the yeoman and load a track and it appear
on the C120.


You need a single NMEA - Seatalk and a single Seatalk - NMEA
conversion somewhere. For reliability I would use the NMEA input and
output offered by your S3G course computer.

You haven't mentioned what brand of GPS you have. Assume it's raymarine,
then the desired picture is:

S3G NMEA out - 42 BT input 1
Yeoman out - 42 BT input 2
42 BT output 1 - S3G NMEA in
+- Yeoman in


42 BT on Bluetooth -- PC

Have fun,

Kees