I'm a cave diver so the answer is yes. But we also don't really talk numbers all that much. The most often case I have to sign numbers is when diving with OW DMs, and then I have to remember to use two hands.
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Military method
We used to flash fuel states to each other when flying in formation in radio silence
Finger(s) vertical is 1 to 5
Finger(s) horizontal is 6 to 9
Clenched fist is zero
For example:
2 fingers held vertically = 2
2 fingers held horizontally = 7
1800 p.s.i. is
1 finger held vertically, which is "1"
3 fingers held horizontally, which is "8"
The clenched fist is obviously dependent on the situation. If you and your team are communicating gas, then the clenched fist obviously means "zero" and not "hold."
If a team mate comes up to you out of the blue and shows you a clenched fist, then it obviously means "hold" and not "zero."
That's really interesting. I didn't realize radio silence meant not even a few bits of information. I always figured there was some kind of ultra wideband that could be used even if traditional radios weren't.Military method
We used to flash fuel states to each other when flying in formation in radio silence
Finger(s) vertical is 1 to 5
Finger(s) horizontal is 6 to 9
Clenched fist is zero
For example:
2 fingers held vertically = 2
2 fingers held horizontally = 7
1800 p.s.i. is
1 finger held vertically, which is "1"
3 fingers held horizontally, which is "8"
The clenched fist is obviously dependent on the situation. If you and your team are communicating gas, then the clenched fist obviously means "zero" and not "hold."
If a team mate comes up to you out of the blue and shows you a clenched fist, then it obviously means "hold" and not "zero."