Green_Manelishi
Contributor
several of the more well known decompression planning software packages allow the user to adjust gradient
factors when calculating the deco obligations.
using GUE "DecoPlanner" as the example, a dive to
100 feet for 15 minutes on AIR (yeah, i know, not
particularly challenging) with a lo-gf of 30% and
hi-gf of 85 (both are defaults) yields stops of:
40 ft for 1 min
30 ft for 1 min
20 ft for 1 min
10 ft for 1 min
reducing the hi-gf to 70% causes all stops to stay at 1
minute EXCEPT 10 feet which is now 4 minutes.
increasing the lo-gf to 40% and reducing the hi-gf to 60%
causes the stop at 40 ft to be removed but yields a
20 ft stop for 3 minutes and a 10 ft stop for 6 minutes.
decreasing the lo-gf to 10% and increasing the hi-gf to 90%
causes the stops to begin at 60 ft for 1 minute per at
60, 50, 40, 30, 20, 10.
conventional wisdom holds that starting stops "deep" is a safe way to dive. without attempting to explain the conclusions i am drawing, other than it is 'better' to start
deep and make several stops of short duration rather than
a few of longer could you elaborate on the benefits/dis-advantages of adjusting gradients rather than staying with
the defaults.
Thanks
factors when calculating the deco obligations.
using GUE "DecoPlanner" as the example, a dive to
100 feet for 15 minutes on AIR (yeah, i know, not
particularly challenging) with a lo-gf of 30% and
hi-gf of 85 (both are defaults) yields stops of:
40 ft for 1 min
30 ft for 1 min
20 ft for 1 min
10 ft for 1 min
reducing the hi-gf to 70% causes all stops to stay at 1
minute EXCEPT 10 feet which is now 4 minutes.
increasing the lo-gf to 40% and reducing the hi-gf to 60%
causes the stop at 40 ft to be removed but yields a
20 ft stop for 3 minutes and a 10 ft stop for 6 minutes.
decreasing the lo-gf to 10% and increasing the hi-gf to 90%
causes the stops to begin at 60 ft for 1 minute per at
60, 50, 40, 30, 20, 10.
conventional wisdom holds that starting stops "deep" is a safe way to dive. without attempting to explain the conclusions i am drawing, other than it is 'better' to start
deep and make several stops of short duration rather than
a few of longer could you elaborate on the benefits/dis-advantages of adjusting gradients rather than staying with
the defaults.
Thanks