As Cathy says, you can unplug the GPS once you have a time and location fix - or just enter your location and time manually, which is what I do with my SLT mount. (It remembers my location anyway, so all I have to do is enter the time and date at the start of each session.) My mount has a second AUX socket on the mount itself, which you could possibly attach the GPS unit to, if unplugging and replugging is too awkward?
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