Help Please. Recall signal...

[ti325v]

Hi all,
I have dived off a lot of boats, and have a problem that I think a lot of people share and might have the bright idea that I cannot find....
I am sick of banging on the ladder for a recall signal.
There has got to be a better way, I myself cannot hear the ladder bang more then 40 meters from the boat.
Open to suggestions.....Please note I am in the third world, so super duper sonar pulses are not available, but I can get a stick of dynamite from the local fishermen !!!! that will certainly get everybody to the surface, and if I am lucky a few will still be alive....
Fire works are not available but I was actually thinking of making some VERY small water proof fire crackers....Watching for bubbles and tossing them in, AWAY from the reef and where the divers are. If I get some body sick on the boat, and we did not bring the chase boat, I want everybody up and out ASAP.
Thanks

 

[mikecotrone]

How about rigging a "DiveAlert Plus" unit to a LP port on your 1st stage that is attached to a long hose that can reach the top of the water? That way you can blast a sub surface horn?

I am a diving newbie, but I am also an engineer so I do like these challenges

Amazon.com: dive alert plus

"In contrast, DiveAlert Plus enables divers at the mere touch of a button to generate a loud blast of sound on the surface that can be heard up to a mile away! Or, by switching the DiveAlert Plus diverter valve for Subsurface signaling the diver can now signal for his dive buddy’s attention underwater!"

 

[dburg30]

Dont they make waterproof speakers? I always thought you could just have a speaker underwater and just tell them to come back

 

[pjhansman]

hire a humpback whale....they seem to have it figured out

 

[Walter]

I am sick of banging on the ladder for a recall signal.

How often do you use the recall signal? Getting sick of banging on the ladder makes me think you are using it fairly often. If that is true, there are probably more important issues that need addressing than how you recall divers.

 

[BigHarryDiver]

How about rigging a "DiveAlert Plus" unit to a LP port on your 1st stage that is attached to a long hose that can reach the top of the water? That way you can blast a sub surface horn?

I am a diving newbie, but I am also an engineer so I do like these challenges

Amazon.com: dive alert plus

"In contrast, DiveAlert Plus enables divers at the mere touch of a button to generate a loud blast of sound on the surface that can be heard up to a mile away! Or, by switching the DiveAlert Plus diverter valve for Subsurface signaling the diver can now signal for his dive buddy’s attention underwater!"

Don't believe all you read in the marketing material. In my experience, you can only hear the underwater quacking if you are very close and not wearing a hood.

 

[mikecotrone]

Don't believe all you read in the marketing material. In my experience, you can only hear the underwater quacking if you are very close and not wearing a hood.

Oh the joy's of Marketing I envisioned a loud underwater fog horn darn.

 

[Johan Broere]

I thought clanging the ladder was for emergencies. For the rest I am on vacation. I will come back when I am ready. Aahh, I love blowing bubbles. Blub, blub and blub.

 

[Doubler]

The Navy uses M80's or Cherry Bombs.

 

[UnderSeaBumbleBee]

There are underwater speakers. A friend of mine rigged his up and played music and then had a recording of his voice asking his bride to marry him. He also has a mic attached on deck so that the boat captain can just say whatever he wants to say to those under water. They used the same system in an accident victim recovery so that the person who had driven the boat could tell him which direction to move. The boat captain was able to give him a verbal compass reading and he was able then to take that heading while still under water. The wattage of the speakers would determine how far away someone could hear you.