Originally Posted by noglider

@Iride01 makes many good points. It helps a lot to understand at least a little of how this stuff works. That way, your expectations will be reasonable. Jeez, those satellites are very high, and the signals we receive from them are very weak, and I assume the math the units use to calculate position is tricky. We have to expect some errors. That the system works as well as it does is a miracle to me. Some people see electronics as magical and therefore expect perfection.