Max Lynn wrote:
What Lisa said originally. Forget the Mapsource bit. It has nothing
to do with the problem. Simply tee off the Data Out + , and Data Out
- coming from the Garmin. These get connected to the VHF's Data In
+, and Data In -, respectively. Make sure the Garmin protocol is set
to NMEA out or In/Out .

"Bob" wrote in message
rs.com...
I have a new DSC VHF marine radio with a + & - input for a GPS in
NMEA format. I have my Garmin MAP76 outputting in Garmin format on
RS232 to an older laptop running Mapsource on my boat as a chart
plotter. I would like to get the required signal to the radio - any
ideas or suggestions ? Thanks, Bob

If Mapsource requires a Garmin-Garmin setting and cannot be tweaked to
accept NMEA, it will not work with NMEA, therefore the only solution in this
case would be a second GPS, outputting to the DSC VHF. You could of course
change you Mapsource software on the laptop to something better, such as
Oziexplorer.
Remove "nospam" from return address.