What type of data do you want to extract/exploit?
gpsd is basically a way to decode live position data from a GPS receiver that outputs a data stream. I have not found anything that indicates the Etrex 22X does.
I am not familiar with the Etrex 22X but from a quick read of the manual you can access stored data on the memory card if installed from the USB port which should appear as a USB storage device (Windows and Mac). If it isn't recognized as a USB mass storage device it might use MTP which should work.
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