I tried using my navigation today to get to a snake call and the it just kept giving me the message Locating GPS. Luckily I had written down some directions before I left. But after over 30 minutes of driving, it never got a GPS lock. I have been keeping the GPS on all the time now because it has been getting worse and worse. At this point, it is about useless for navigation. Any ideas? This is a function that I REALLY need and I need it to work fast and on the fly.