I don't think it's a bad idea at all. Just don't test it before your dive with a boatload of people. They're loud and such a maneuver would certainly tag you as a novice, certified in '69 or not.
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I have been using the Dive Alert made by Ideations since 1992. If it's not connected its in my pocket for easy attachment should I need it. As to testing it before the dive, here is what I do.
1. I ask the crew if they know what it is? If they do i ask them to tell me.
2. If they don't I explain what the device is and how it works
3. I sound the sucker off so they are clear what it is and what it means.
A saftey device is USELESS unless the people who need to hear it know what it is. Think about it -- how many times have you been someplace and heard an alarm or a siren and then looked the other way? While the Dive Alert is probably the single most significant device we have unless they know you have one and WILL use one it's useless.
ASSUME nothing with boat crews. Assume even less if you don't tell them what you want.
Develop a signal system that includes both the DIVE ALERT and a SURFACE MARKER sound is good but sight and sound is better. Bag up first then on the surface -- three long blasts for alerting them that you are there but need a pick up -- -rapid blasts need help etc -- you get the point ..... A signal mirror is also helpful to have.
Good Luck