Same experience as Bill, using a Garmin 76C which has a less sensitive receiver chip than yours. I made an extra long UBS cable so I could leave the GPS in the cockpit and the laptop below in the cabin, with the receiver acting like a GPS antenna for the laptop. Found I could leave the receiver in the cabin too when we were down in the US off the eastern seaboard. At the time I was using OziExplorer and Garmin's moving map software, but any charplotting software that is Garmin-receiver aware would work with a USB cable.
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1974 C&C 27
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