I would check to see it BB maps can find satellites. If it can I would say uninstall and reinstall your garmin app. If not the problem could be the GPS itself. Do you have it set to use the aGPS or the regular GPS. Whatever it is on I would try the other. If you have it set to aGPS and there is no assist available it should revert back to straight GPS but I am not 100% sure on that. Keep in mind that on the straight GPS setting doing a cold start it can take up to 15 mins to find and lock onto satellites.
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