I ran nav a bit yesterday and had a slight issue as well. The first time I started it, I got a GPS lock, written directions and turn by turn voice but a black screen. Thought maybe I didn't have gmaps installed. Exited nav, checked for gmaps (it was there) and restarted nav. This time, worked like a charm. That has been my only issue so far with 1.2.
I read on rootzwiki someone else had the same problem with the black screen. He said he was going to try the method I used below.
Just as an update in case anyone cares I got my turn by turn working and am officially on MR2.75 for the foreseeable future. I ran 3 speed test and the average was around 38 down 13 up The highest average I'd ever gotten before was 25 down 6 up. I did the following to get my GPS working properly..
Full wipe
Flashed BAMF 3.0 RC4, got GPS signal then reboot>recovery
Full wipe again
Restored my MR2 CM7 backup from last night, opened maps>navigation and instantly got the turn by turn directions. I've tried it multiple times since and it's definitely working
I thought the people who said to do this method were crazy as I don't see how the hardware can keep it's software settings through a full wipe and restore, but it friggen works! I'm so psyched you have no idea. I feel like a kid on Christmas morning now that I know this ROM is working 100% properly
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