All good advice.
Re the 54-satellite receiver; LOL.
There are only about 21 birds in total. Of which you'll be very lucky to see more than 12 at any point on the globe. And the quality of your fix doesn't really change beyond 6-8, it's a law of diminishing returns with triangulation. So ignore that particular little marketing hype.
Note that Bluetooth GPSRs still require power so not quite cordless. They can also be used with just about any computer, USBs require something with USB host.



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