I use one every day, it has replaced my paper versions, just don't tell CAA.
In my other life, I use a goto mount, a CGE, and like most they require an accurate fix to work their best. There is a clip on unit for the CGE, but the simplest method for mew was to use my built in GPS in my phone and manually enter the lat and long.
Depends on what you want, and what you expect from them Mike.
Gary
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