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I used to use my watch but it's never loud enough. I use my phone as a camera and GPS with OnX, audio books and podcasts. I'm not leaving it in the truck as it an important tool so no reason not to use it as my alarm
I have a Rino. It has an alarm and it will turn the unit on from a powered off state when the time comes for the alarm to go off. Very useful!
Ya, as I normally don't wear a watch (anytime of the year) I used to buy cheapo alarm watch (Timex Indiglo?) every few years and take that back in to the backcountry. I have found that the alarm sound on those isn't very loud, so, I picked up a tiny battery powered alarm clock that seems to do the trick. Something like this: https://www.amazon.com/Peakeep-Battery-Travel-Ticking-Aquamarine/dp/B06XR712K7/ref=sr_1_4?keywords=battery+alarm+clocks+with+light&qid=1557500168&s=gateway&sr=8-4
My phone alarm goes off even if my phone is off. It turns on for the alarm