There is really no dedicated channel for emergencies. Even the lower cost radios have scanning capabilities these days, so that shouldn't be an issue.

My suggestion would be to set it to NOT use the so-called "eliminator" or "privacy" codes. On mine I do this by setting them to code 0.

I like the comment made elsewhere here to submit a plan to use a radio only for five minutes at the top of each hour, or on the half hour in order to conserve batteries.

Also, when broadcasting on a FRS/GMRS radio antenna remember that height is the primary method for increasing range. They essentially broadcast through line-of-sight, so you're not going to get over large hills and such. Increased power helps a bit, but only a bit. Users of "real" GMRS radios - with removable antennas - have been known to raise an external antenna up a tree using rope and a long antenna cable in order to maximize range.

Ken K.