Question Dive planning exercise, please check my work
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I never read the detailed primary source materials, myself. I was taught during my open water course (YMCA/NAUI, in 1986) that the U.S. Navy brought up their divers (salvage/repair divers wearing heavy gear) from air dives at an ascent rate of 60 fpm per the U.S. Navy Tables. This predated the use of these tables for SCUBA.
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No that is completely prohibited. 1) you'd need a permit from DNR (they own all submerged lands) and they aren't going to give you one, and 2) you'd kill all the waterskiers blasting around when they run into your buoy.
In the past they've been protected by anonymity, not publishing the numbers, the fact that most are nearly impossible to find from shore even with a scooter, and lastly depth. GUE Seattle has the NOAA data online now and Scott Boyd's book and website has a bunch of their numbers, but there's nobody to mentor newer divers in how to actually dive them. And most of the AN/DP instructors are fairly well clueless themselves. And the rare GUE T1 course isnt really teaching anyone the boat practical side of things. And no charters as role models either, they all went out of business since scooters became common.
Ascent Rates
Ascent rates are influenced by different variables, and should be kept slow to avoid complications. Read more about ascent rates.
dan.org
Safe Ascent Rate Guidance
When I read through different diving physiology discussions, I see reference to both 30 feet/minute and 60 feet/minute as the "maximum safe ascent speed". Is this one of those things where the maximum is 60 feet/minute but 30 feet/minute is recommended to provide a margin of conservatism? Or...
Because of the development of scuba apparatus in WWU, the tables were now made to include
more appropriate depth increments, and the rate of ascent had been changed from the earlier 25 fsw/min to 60 fsw/min, where it has remained. The ascent rate was a compromise; Navy scuba divers wanted a rate of 100 fsw /min, but it was difficult to winch a tethered diver up at this rate, and the same rate had to be used by all Navy divers (Lanphier, 1990). The choice was a figure somewhat in between,
the easy-to-calculate 60 fsw/min or I fsw/sec. Decompression "theory" did not enter into this choice.
which is from page 15 of the 1994 DSAT report on the development of the RDP; that report is too big to attach here. It used to be available on Rubicon. I'd be happy to provide it to you on Dropbox if you want a copy.
The DSAT Report on the RDP is now available in the ScubaBoard Download Library.
Info - The DSAT Recreational Dive Planner (RDP), 1994
Document Name: Development and validation of no-stop decompression procedures for recreational diving: The DSAT Recreational Dive Planner Authors: R.W. Hamilton, Raymond E. Rogers, Michael R. Powell, Richard D. Vann, with Richard Dunford, Merrill P. Spencer, Drew Richardson Attached is the...
Additional info on Why 60 ft/min.Ascent Rates
Ascent rates are influenced by different variables, and should be kept slow to avoid complications. Read more about ascent rates.See also this quote:Safe Ascent Rate Guidance
When I read through different diving physiology discussions, I see reference to both 30 feet/minute and 60 feet/minute as the "maximum safe ascent speed". Is this one of those things where the maximum is 60 feet/minute but 30 feet/minute is recommended to provide a margin of conservatism? Or...scubaboard.com
Because of the development of scuba apparatus in WWU, the tables were now made to includemore appropriate depth increments, and the rate of ascent had been changed from the earlier 25 fsw/min to 60 fsw/min, where it has remained. The ascent rate was a compromise; Navy scuba divers wanted a rate of 100 fsw /min, but it was difficult to winch a tethered diver up at this rate, and the same rate had to be used by all Navy divers (Lanphier, 1990). The choice was a figure somewhat in between,the easy-to-calculate 60 fsw/min or I fsw/sec. Decompression "theory" did not enter into this choice.which is from page 15 of the 1994 DSAT report on the development of the RDP; that report is too big to attach here. It used to be available on Rubicon. I'd be happy to provide it to you on Dropbox if you want a copy.
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