National Parks and Camping (advice for me + general discussion)

[Stumpy]

A few people here commented on the dangers of hiking alone, but no one offered any suggestions to minimize the risks... I'd like to hear some advice if anyone has experience.

I always take an GM/FRS radio, but I'm guessing that's got limited to no use in reality. It does at least provide weather information.

I know serious hikers will respond to whistles, but not sure how many people really know that anymore.

Anyone know much about personal locator beacons? They seem to be $450+, which is kind of steep for how often I get out camping, but I am almost always off on my own. I've looked at the TerraFix website, but all that says is it's the greatest thing in the universe. Will they work everywhere (middle of Alaska for example) and can I pretty much know 99% of the time I push the button someone will find me in a few hours? a few days?