I called a dive out of sheer boredom in Oaxaca last summer. Vis was nil and the only way I could locate my buddy was the sound of his reg. It was a good learning experience for 15 minutes or so and then it just sucked.
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It's funny how many in this thread claim bad vis as their reason for calling a dive.
While nobody should ever question your buddy's reason to call a dive (the thumb is a command, not a request, we'll discuss the issue when we have solid ground under our feet), it's interesting to me that while I've never called a dive due to vis, I've called dives due to surface conditions. Granted, I've never been in really crappy vis (my worst dive ever had some 1-2m vis), I've always found that that hasn't been a serious concern to me. Getting into and out of the water without being uncomfortably thrown around, on the other hand...
Good enough reason. If it isn't fun, why do it?It was just so damn boring cause there was nothing to touch or play around with.
Derepmet visibility: when you're only able to read "Tempered" backwards in your mask. Been there and called that. My first dive off Venice Beach, Fl was just such a dive. In fact, my buddy suggested that we use a Jon Line to tether us together. On my descent I ran into the bottom. Boink. I was so surprised I let go of the tether. I was only in 12 feet of water, so I surfaced, found his bubbles and tried to swim down to him. I tried to find him over and over for the next 90 minutes where he finally emerged. "Wow, you're a great buddy! I never felt you tug on the Jon Line even once!". Yeah, if only I had that Jon Line to pull!It's funny how many in this thread claim bad vis as their reason for calling a dive.
The only time I've used a buddy line was when the surface vis was estimated to be around 1m/3'. We were lucky, it cleared up below 5-8m depth, but damn, it was murky. Good thing I always bring a light.Derepmet visibility: when you're only able to read "Tempered" backwards in your mask. Been there and called that. My first dive off Venice Beach, Fl was just such a dive. In fact, my buddy suggested that we use a Jon Line to tether us together. On my descent I ran into the bottom. Boink. I was so surprised I let go of the tether. I was only in 12 feet of water, so I surfaced, found his bubbles and tried to swim down to him. I tried to find him over and over for the next 90 minutes where he finally emerged. "Wow, you're a great buddy! I never felt you tug on the Jon Line even once!". Yeah, if only I had that Jon Line to pull!
Given that your buddy doesn't respect that there's no required reason for giving your buddy the thumb.An easy, no pressure, procedure for thumbing a dive:
1 - Shake hand
2 - Point to ear
3 - Shrug (optional)