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In many world class dive locations, the Dive Master does not enter the water carrying/pulling a dive flag.{Cozumel, Galapagos, Coco's, etc, etc} They shoot an SMB towards the end of the dive. Jupiter is very advanced diving and some deep dives are not for everyone. A diver may want to choose a different venue with alternate procedures and shallow dives, that use a flag.
Anyone know of a comparable radio at a cheaper price?
None were on renreathers.I know a number of folks on this charter. They were on rebreathers. Following hot drop rebreathers sucks at best and the divers don't know they are lost, so they aren't as quick to shoot a bag as the captain wishes they were. Kudos to the Captain for calling for help as soon as he got to worrying about them, too many captains say to themselves "I'll just look for 10 more minutes". Plenty of time for disaster.
You are incorrect. Watch the video again and you'll see at least one rebreather diver climbing aboard the boat.None were on renreathers.
Some of those divers are climbing aboard the dive boat with fins on. Makes things a bit more awkward, no?