Thinking more about Montanero's question, I'm not sure I answered it as well as I wanted to.

I do not believe that any state police agencies monitor CB Channel 9 any more. You might find another CB user willing to help you, but my experience with CB has not been so positive and I don't own a CB transceiver any more.

As a ham, if you can reach another ham, it's a given that they'll relay your message to first responders if they can.

For FRS and MURS, range is poor and you're unlikely to reach anyone you didn't bring with you. GMRS is better in some areas. On the water, there's a darn good chance that Marine VHF is being monitored by the Coast Guard or a local law enforcement agency. I'm not aware of any land-based radio service where this is true.

Cellphones, obviously, are the way to go if they work where you are. I'm still thinking long and hard about buying an InReach.