There are various recommendations how long one should not fly after surfacing from a dive. DAN has recently done a study where they did Doppler measurements on a plane and recommends an interval of 12 hours after a single dive and 24 hours after repetitive diving. But one would think that it should be possible to … Continue reading “Can we calculate no-fly-times?”
In VPM-B you can shorten your deco by doing another dive before. Sounds crazy? But this is what this model predicts as I recently learned from Subsurface user who thought he was reporting a bug. To be concrete, let’s plan an air dive to 40m with 30min bottom time (just for concreteness, maybe this is … Continue reading “Shortening deco by diving deeper”
[This is a post by Rick Walsh but this information got lost when this blog moved to a new server.] When I mentioned to one of my dive buddies I was considering taking a GUE Tech 1 course, his response was “I wouldn’t trust that ratio deco crud”. Another explained calculating ratio deco by: average … Continue reading “Ratio Deco – is it nonsense?”
I often see complaints that two different dive planning programs or dive computers do not give identical deco schedules even though both claim to implement the same decompression model. Like both being Bühlmann with gradient factors. Once you implement a model, it should deterministically give you a plan for the ascend. And yes, in an … Continue reading “Why is Bühlmann not like Bühlmann”
