You say your sounder has a GPS input, but not the source of the GPS data. You could be having proprietary issues. between the GPS reciever and the sounder.
The solution I would suggest is having a separate GPS reciever. For less than $40 you can get a "hockey puck" reciever with a USB end that plugs directly into your laptop. It requires no separate power, and will work from inside the cabin. It's what I use with my laptop and chart program. If you're interested you can check it out: Globalsat BU-353 USB GPS Receiver, BU353
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John
Ontario 32 - Aria
Free, is the heart, that lives not, in fear.
Full, is the spirit, that thinks not, of falling.
True, is the soul, that hesitates not, to give.
Alive, is the one, that believes, in love. JCP
Music on the Wind -
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