I would hate that idea, as it is every time someone on a boat im with jumps in the water another boat is dropping right next to us. stinks even worse hitting the "common" spots here because they get packed at times (ive seen 4 boats dropped on playground/ cross current barge ares at times). its kinda like people see a boat with divers that just pull right up to a spot and drop get the idea that we know where to go so they just kinda lurk behind us and copy what we do rather the invest in fish/depth finder and gps. if it comes down to people needing radar to find divers to not run them over i think they need to require boating licenses with recertification every like 5 years.
You have a very different perspective than I.... If I take my boat out[34 foot Regal Express Cruiser] , we go to places far from other divers..there are plenty of sites most dive operators don't like to visit, because they take too long to get to/cost too much in fuel and time. Or, you don't go out at the typical morning or afternoon dive trip times.
And particularly when we do deeper dives, like the 130 foot ledge or the 220 foot ledge, or the deeper wrecks, you really don't have any other divers to bother you....although fishing boats are ever present on ANY good dive site in deep water.
When we are on these deeper sites, the distance from shore is a deal breaker for swimming home. Having a fool proof way to ensure that we can be found, even if some wierd emergency or problem has our boat "no where to be seen", when we come up, is very important to us...So the radar flag would be good for us, or anyone who dives far from shore, or in areas not crowded with divers.\
Years ago, I used to dive over 25 miles out, off of Fort Pierce....Awesome deep dives, but if the boat lost sight of you....you could be in the water for a VERY LONG time....
I could make the flag myself, but I still think there would be a good market niche for this...there are plenty of divers who must dive areas far from shore, ie., not everyone dives the close stuff off of S Florida or like it.
Regards,
Dan V