If you are in a high, exposed location, radios are great. If you are in a canyon or deep valley, fugedaboutit. My opinion - don't screw around- get a good PLB. If you need help, you want a reliable way to communicate that need. PLBs cost more, of course, but what is your life worth?

If you are in a relatively crowded area,there is also an excellent chance that traditional methods of signalling - . smoke,whistle, mirror flashes-will work quite well. A really good whistle only costs about $5, if you want to save money.

I notice that many rescues are now initiated by the victim calling or texting on their cellphones, which almost automatically give some location data. SAR folks really like location data.

Either get a whistle, a PLB, or carry your cell phone. Don't waste your valuable time with toy radios.