Well said. Call it a "flight plan", "float plan" or whatever, that is what is going to get you found. Relying on technology to solve the problem is just taking too much of a risk.
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Taking a $100 (or less) radio in place of the correct training and equipment is just stupidity. Relying on a VHF simplex frequency that someone may or may not be monitoring as your solution is idiotic at best.
Wanting to save the day by playing radio is just pointless. I agree, some people are just looking for any reason to key up on a public safety frequency. IF that is your last choice and you have fully exhausted everything else, and the end is near, then fine, but calling into the Sheriff on their own frequency because you didn't prepare is just going to cause problems.
I'm with you and iepoker on this. Pre-planning and preparation along with the right equipment is the only way to go.
Now, as a first responder and EMT for most of my adult life, one of the recommendations that I'd offer is for hikers and climbers is to NEVER go out without making sure that your info is available to rescuers. Sign the darned log book at the trail head and leave enough info to be helpful. Make sure someone has your entire trip info and don't deviate from your plan. Save that unexpected side trip for another day.
I might get beat up a bit on this suggestion, but I think it's worthwhile. When you leave your trip info at the trailhead or whatever, include any two-ways that you might carry and frequency. (I'm specifically not thinking of a radio on the local sheriff's channel here.) If you carry a GMRS or FRS or (ham for those with tickets) AND note it in your trip plan, it would be a safe bet that the SAR teams will take the time to bring the same capability with them. Final points: 1. Stick to your selected channel and don't channel hop. 2. If the radio isn't fully charged, it's not going to be much use. I always have at least one spare, fully charged battery for my portable close at hand as well.