Hello, My boat has a Standard Horizon GX2200 series VHF radio in it. Being new to the boat as of this past summer. i havn't spent much time messing around with the radio, but with some travel plans set for this spring/summer, i want to ensure it is working properly. It seems i can receive traffic to the radio....i hear brief conversations from folks, i can tap into the weather channel to hear forecasts etc. However, when I attempt the automated radio check, i hear nothing. According to the Sea Tow website there is a radio check station only a few miles from my marina, so i assume this should work. I have changed the power from low to high with still no luck. When i press PPT, the screen of the VHF says "TX" so i know it is attempting to transmit. Is there something else i should be trying? At some point should i just hire someone who knows about this stuff to make sure it's working? Any advice would be appreciated, thanks.