I have a droid 2 with gummy 2.5 and the Luna Theme ported by Mikey. I also have the UD animated battery added from the UD Gummy 2.5 theme posting. My GPS is fine and Gummy 2.5 has not caused any known GPS issues. Here is a screen shot of the phone tester GPS screen with wireless network useage turned off to be pure GPS stats alone...
My google maps with nav. isn't working. It just keeps saying "getting driving directions" been running gummy for 2-3 weeks. Hasn't worked since ii changed to gummy. I tried clearing data, uninstalling, reinstalling. Been reading on here for about 3 days trying to find a resolution to no avail. I'm definitely not paying 70 bucks for something like co pilot on the market. I can buy a garmin for 40 in the interwebs.