V-Planner Dive Plan for NDL dive doesn't look right...

[WreckWriter]

ScoobieDooo once bubbled...
According to Table Tutor dive tables, a dive to 100 ft is more than 16 mins, I believe I am seeing 25 mins. Quite a differance in times, 9 mins to be exact.

What exactly are "table tutor" tables? Is that what you're actually diving?

If it gives you 25 at 100 its obviously Navy tables in a different wrapper.

Bottom line is that you can dive Navy tables and have more perceived time available or you can dive a modern algorythm (VPM, RGBM, modified Buhlmann) and be safer and feel better after your dives.

Those of us that have been diving for more than a few years all dove Navy tables in the past, most of us managed ok. What Rick says is true, for repetitive dives the Navy tables get pretty conservative. Based on what I've seen though (no clue if stats would bear this out) I've always felt that there might be a problem in the 80-1-- foot area as most of the divers I've seen get bent have gotten bent in this range. Coincidence? Maybe.

WW

 

[padiscubapro]

WreckWriter once bubbled...


What exactly are "table tutor" tables? Is that what you're actually diving?

If it gives you 25 at 100 its obviously Navy tables in a different wrapper.

Bottom line is that you can dive Navy tables and have more perceived time available or you can dive a modern algorythm (VPM, RGBM, modified Buhlmann) and be safer and feel better after your dives.

Those of us that have been diving for more than a few years all dove Navy tables in the past, most of us managed ok. What Rick says is true, for repetitive dives the Navy tables get pretty conservative. Based on what I've seen though (no clue if stats would bear this out) I've always felt that there might be a problem in the 80-1-- foot area as most of the divers I've seen get bent have gotten bent in this range. Coincidence? Maybe.

WW

It also depends on the schedule.. Some NAVY schedules are know to have some serious risks.. the 150ft table comes to mind.. doing repetetive 150ft dives has a known dsc risks.. I have seen various numbers published (depends on wht they are calling a hit) anywhere from 6% on the low side to as much as 14% on high estimates.


The navy tables were basically designed as deco tables and If I remember correctly the surface halftime used is the 120 min compartment, while many other tables use the 60 min compartment.. This is definately a necessity if you are deco diving on air because you are still on gassing in the slower tissues.. The navy doesn't do gas switches like tech divers do.. decoing on 50% or 100% besides helping the offgassing, stops the slow tissues from ongassing..

on 50%@20 you are at an EAD of .5feet, shallower than this, you are at the equivalent of altitude..

on 50% @ 30 feet you are at an EAD of less than 7 feet..

SO all your long stops are shallower than even the 10ft stop..

 

[padiscubapro]

ScoobieDooo once bubbled...
According to Table Tutor dive tables, a dive to 100 ft is more than 16 mins, I believe I am seeing 25 mins. Quite a differance in times, 9 mins to be exact.

There SHOULD be a difference like I stated earlier, no deco tables and decompression oriented schedules use a different limit for the surfacing gradient.. Tables based on Navy limits also use different limits on what is good/ bad.. the 2 things you must consider is (1) that to the navy getting bent isn't a problem they have chambers and you are replaceable..(2) most other tables have been modified to limit when bubble have been detected.

Even my old us divers monitor 2 which uses a Spencer model only allows 17 mins NDL@100

 

[ScoobieDooo]

Table Tutor is a free scuba dive table shareware program...