GPS 12Ch, 16CH 32CH 50Ch

More channels allows the receiver to track more satellites -- you're still at the mercy of the number of satellites in view and signal quality, though. Also most receivers may track satellites that are

Thankd - Joseph

There is no possible advantage in going above 12 channel. That is the maximum number of active satellites that could ever be visible at any given time. Other than that, 4 to 6 channels looks like the best range for quality versus cost.

Thanks Joseph, But why do the GPS makers have 12 - 50 channels? if 12 is the maxium, what is the performance benifit for more than 12?

Joe

The GPS reciever can keep _track_ of more then 12 channels, but only _use_ 12 in their calculations.

I don't think there are currently more then 14 flying at the moment anyway.

donald

The full constellation of 24 satellites and some (5 IIRC) in orbit new spares are already flying. The issues is, that half or less are visible from any point on earth because earth itself is in the way.

Due to some design decisions 24 active satellites is all that there will ever be.