Its been said in this thread already - Someone has to be on the other end listening. Sadly, many Hams think Ham Radio will save the day in any situation and while that theory is true, Its still a theory. Radio of any sort is a two-way street! That means, you are on one end of that transmission and someone else is answering you on the other end. You can have all the radios and technology on your belt that you want, if no one is on the other end, as I have found in all of my years of hiking, your radio is about as useful as the rocks you are walking over on the trails.
I always carry a radio when I hike but I always carry something that rarely goes dead on me, even in Maine - My cell phone. Satellite phone is another that has been mentioned and lets face it, no one likes to rely on technology, but the reality is, unless you are allowed on public safety frequencies, Your cell or satellite phone is your primary means of communications and your radio is secondary. The sad reality is that in the radio world, the popular mode of operation is HF. Barely anyone monitors VHF and UHF. I live in Central Maine and while it isn't in the boonies but not in the city, we have a lot of woods and people who hike. The one most boring thing I do is monitor all 22 UHF channels (GMRS/FRS) on one radio and 146.52 on the other radio. More Hams need to get back into doing this, even if it means setting up a scanner with just those frequencies. It might mean someone's life one day.
Best advice, GPS tracker and a Sat phone or cell phone, whichever works best.