If I were to go shore diving (most likely snorkeling) just my buddy and I. Should I carry a radio. I was thinking of putting a radio in a waterproof bag on my person. And if I needed it I could take it out. I guess I may as well put my cell phone in the same bag. Does this sound reasonable?
I guess to answer your question regarding carrying a radio or cell phone (in the water with you if I understand you correctly), a little more detail is needed:
1. How remote is the shore area you'll be diving from (I'm assuming ocean diving)? The reason I'm asking, is to determine if a VHF radio the best way to get help, or a cell phone? Is there cell phone reception in the area you want to dive? If you are fairly near a city or town, calling 911 will probably get help to you fastest, but in other more remote areas (of the US) contacting the Coast Guard might be faster or the only option.
2. In what diving scenarios/emergencies do you anticipate needing to call for assistance? Being swept offshore, lost buddy, DCS, drowning or near-drowning, injury? I'm not trying to be morbid, I'm asking this to determine whether a radio or cell phone might be better.
90% of all of my dives have been shore dives. I keep a cell phone
in the car. In the time before cell phones (yep, I'm that old), I just knew where the nearest payphone or house was.
My feeling is that if you feel you really need to carry a radio or phone
into the water with you for safety, you should reevaluate the overall safety of the dive site. The reason is that any help you could potentially summon by radio or phone to help you
in the water will probably take too long to get there. The only exception I could think of for carrying a radio or cell phone on a dive would be if you'd been swept offshore... and in that case I would have goofed badly in my evaluation of the conditions at that site.
Don't do a shore dive if you are not 100% comfortable with the water conditions, and confident that you could swim all the way back
on the surface if you had a gear failure at your furthest point from shore. In fact, the criteria I use personally is I need to be confident I could tow my
buddy back on the surface from the furthest point.... so these days I dive in more "tame" conditions that when I was in my 20's.
Safe Diving!