Can you tell me how long a USB cable can be before the gps signal is lost. 15ft, 20ft?
Standard USB cables are limited to around 16ft total by spec, although you may get by with more I wouldn’t recommend it other than for testing.
You can however go longer with an “active” cable, eg. https://www.amazon.com/gp/product/B0002D6QJO
I’ve been using a 50’ “active” cable for years without issue.
75’ here, to of the mast to cabin.
Was not a cheap one though.