Northwest Dive Club

so a few months ago I went diving at Lake McDonald, and Lake St. Mary in Glacier National Park. The dives were a lot of fun, and McDonald is an amazing dive, but during those dives I cut the tables on V-planner and did the dives that way. My question was is there a method that is used for correcting Ratio Deco profiles for altitude?

Not really. Its trial and error like most deco is anyway. Fortunately, Lake Macdonald is not very high. Lake St. Mary is 4,500ft IIRC. About 2/3rds Lake Tahoe (6,500ft) which is done with very minimal RD padding - more due to temps than altitude. The water equivalent of ~4,000ft less atmosphere is 5ft of water or <0.2bar.

Yeah lake McDonald was minimal. Lake St. Mary we planned higher, because we cross Logan pass that night. Lake St. Mary was pretty bland anyways I didn't feel as if though we missed much, but Lake McDonald was an interesting dive.

kitsapdiver wrote:so a few months ago I went diving at Lake McDonald, and Lake St. Mary in Glacier National Park. The dives were a lot of fun, and McDonald is an amazing dive, but during those dives I cut the tables on V-planner and did the dives that way. My question was is there a method that is used for correcting Ratio Deco profiles for altitude?

you can compare the dives in v-planner with and without the altitude adjustment and take the difference in deco times and apply that overall correction in deco time to the ratio deco profiles.

Diving EAN32 with air tables is quite conservative up to most reasonable altitudes as well. (which can also be confirmed wih something like Vplanner although Ross adamantly states its not to be used for no deco dives.)

CaptnJack wrote:Diving EAN32 with air tables is quite conservative up to most reasonable altitudes as well. (which can also be confirmed wih something like Vplanner although Ross adamantly states its not to be used for no deco dives.)

vplanner only for nodeco dives? Seriously?

Only for deco dives.
Not for non-deco dives.

mz53480 wrote:

CaptnJack wrote:Diving EAN32 with air tables is quite conservative up to most reasonable altitudes as well. (which can also be confirmed wih something like Vplanner although Ross adamantly states its not to be used for no deco dives.)

vplanner only for nodeco dives? Seriously?

Backwards, its not intended for no deco dives.

airsix wrote:Only for deco dives.
Not for non-deco dives.

I'm confused. If I'm a left handed buddhist at the equator on the vernal equinox, at altitudes above 2,013 meters, and I have no plans not to do a non deco dive, is vplanner right for me?

Joshua Smith wrote:

airsix wrote:Only for deco dives.
Not for non-deco dives.

I'm confused. If I'm a left handed buddhist at the equator on the vernal equinox, at altitudes above 2,013 meters, and I have no plans not to do a non deco dive, is vplanner right for me?

You need a buddha, regardless of elevation. Rub his belly, he'll tell you when to go up.

CaptnJack wrote:

Joshua Smith wrote:

airsix wrote:Only for deco dives.
Not for non-deco dives.

I'm confused. If I'm a left handed buddhist at the equator on the vernal equinox, at altitudes above 2,013 meters, and I have no plans not to do a non deco dive, is vplanner right for me?

You need a buddha, regardless of elevation. Rub his belly, he'll tell you when to go up.

So, I need bplanner.

Ben, Richard--thanks. Seems that my double negatives caught up to me.....

I thought every dive was a deco dive....