External GPS for TM-D710

I’ve been running my TM-D710 in the car for a while using a Garmin GPSMap 60CSX which works well but does add clutter to the dashboard and is just another device to remove when leaving the car in a public place. I could upgrade to the newer TM-D710G but I can’t justify the £550 price tag just to get a built in gps so I have decided to add a gps unit to my existing unit.
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GPS antenna fix

I was given a broken active GPS antenna by a pilot friend. It’s made by Gilsson who are known for their great GPS antennas so I thought I would have a go at getting it working.

On first inspection, it seems that someone has removed the original thin coax and replaced it with some thicker coax. There has been a hole drilled in the bottom of the case and the new coax has been inserted through.
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