I was sailing today and I couldn't receive any transmissions on my brand new West Marine VHF580 radio. I could yesterday just fine. There's a flashing status symbol that looks like a tie-fighter with three lines under it (maybe a GPS error I'm guessing, although it's not hooked up to any GPS unit and isn't required to be). It also says "Input Position" and it takes me to a coordinate input page. I did an MMSI test call to the Coast Guard test number - maybe it won't let me transmit until I enter some coordinates first? Any ideas?