I'm still sort of new at this but I figured I'd chip in with my 2 cents.
The GPS sats are military, and part of the agreement made for making them available for civilian use is that accuracy is restricted. Military units can get within a meter, but it's sort of pointless to use them because no one placing the cache uses that sort of accuracy.
TL;DR- within 10 feet of a cache for civilian GPS is better than fine.