GPS technology testing

I bought a pair of WAAS enabled, GPS mouse, only to find it ... not so good. I used it on my trip from Rhode Island only to find problems with the data. For example, non-ASCII text and limited satellite coverage.

Back home, a friend had another GPS/GLONASS mouse so I test both by running hours and then looking at the altitude and satellite counts:




Does anyone have another GPS mouse they would recommend for testing?

Is there a credible source that might have GPS mouse performance metrics?

Thanks,
Bob Wilson