What are the opinions on having a cell phone in a watertight /waterproof case for things like this?
At least you can call (if you have a signal) for help, and have them triangulate your position.
Then again, cell phone signals are fairly touch and go.
I have a cell phone in a waterproof container. I bought it when I was a new diver. My LDS was like, "Why would you want to take your cell phone with you !?!" I smiled and said it sounded like a good idea.
I bought it mainly for diving in the US, where hopefully I'll have a cell signal if I get lost.
The phone won't work out of the US though, or if I (and my phone) get swamped by a wave.
There are better gadgets on the market today that are more reliable and seaworthy.
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