Hi,MaineSailor.Per#3,Not a steel
boat?- in my FG boat with OpenCPN
the gps' I have tried work fine inside.I've used a Holux several years-now I've got a Pharos that came with Microsoft's "Street and Trips".Also,the variety of old non-usb Garmins and Magellans via a "serial2usb" adapter work inside.My cell phone
gps too.If in the event you d
o have trouble,the a 6' usb cable extender to put the gps in a better place will see you through,I think.
I have a dinghy
on cabintop whilesailing on cloudy,rainy days -no problem.You might move the gps around a little
to improve reception
but it's tweaking.A cheap
source for that Pharos was EBAY because the Street+Trip package(WITH GPS included!) gets stale every year and get heavily
discounted.Mine cost 15$ US...