GMRS = is there a standard hailing frequency?

Jmac00

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I passed my HAM, Technician license at Quartzfest on Wednesday January 24th, and went back on Friday and got my General License on the 26th

Anyway, we got a TYT-TH-7900 VHF/UHF radio. Put a CA-2x4SR antenna on the jeep, but we can 'jail break' the radio to receive and send GMRS ( which is why we got the TYT). I was just wondering if their is a general hailing frequency, like channel 19 on CB, or Channel 16 for marine radio. Just in case we're out wheeling in the desert by ourselves and something breaks and we need help and there is no phone signal.

TIA