ATJ
Contributor
I was playing with the Dive Planner feature on my Garmin Descent Mk1. I'm using GF40/85.
If I put in a 30m dive on 21% it tells me the NDL is 12 minutes. Seems low, but I can accept that as I have medium conservatism.
I can then plan a second dive. If I put in a 60 minute surface interval and then dive to 30m on 21% again, the NDL is still 12 minutes. How can that be? Surely I still have quite a bit of residual nitrogen and the NDL should be significantly less.
Do Garmin have it wrong, or does Bühlmann shorten the NDL on the first dive to allow for a longer NDL on a second dive.
Interestingly, if I was to plan with DSAT tables and did a 12 minute dive to 30m on air, had a 60 minute surface interval the NDL for my second dive on air to 30m would be 14 minutes. The end result is similar even though DSAT has an NDL of 20 minutes for the first dive.
If I put in a 30m dive on 21% it tells me the NDL is 12 minutes. Seems low, but I can accept that as I have medium conservatism.
I can then plan a second dive. If I put in a 60 minute surface interval and then dive to 30m on 21% again, the NDL is still 12 minutes. How can that be? Surely I still have quite a bit of residual nitrogen and the NDL should be significantly less.
Do Garmin have it wrong, or does Bühlmann shorten the NDL on the first dive to allow for a longer NDL on a second dive.
Interestingly, if I was to plan with DSAT tables and did a 12 minute dive to 30m on air, had a 60 minute surface interval the NDL for my second dive on air to 30m would be 14 minutes. The end result is similar even though DSAT has an NDL of 20 minutes for the first dive.