Hi Everyone.   I think it's time to upgrade my caching phone, as the GPS performance seems to have tanked.  Maybe the antenna's come loose inside, I dunno.  Anyway, I got 3.5 good years out of it, so I'm shopping.  And the one I'm looking at supports four satellite systems, which I gather are all the systems currently known to exist.   Does anybody have experience caching with a 3- or 4- system device?  Is there a noticeable improvement?  Does the caching app you use even ack