I received my nitrox certification about two months ago but I am still unclear on one thing. The LDS I certified at says that since I dive at an elevation of 6300ft I should adjust my nitrox limits for a theoretical altitude. So at a actual depth of 110ft at this elevation I would actually be diving at a theoretical depth of about 137ft. If I figured my maximum mix for actual depth, then using a mix of 37% would put me at a maximum 1.6 ata. If I figured my mix by theoretical altitude though my max mix would be 30%.
Speaking to another LDS, they said I only need to figure the actual depth into the equation and near as I can tell my computer which is supposed to automatically adjust for altitude does not change what it suggest for maximum operating depth at different altitudes.
If anyone can give me a definitive answer I would appreciate it. I would like to have the benefits of diving with a higher mix but being that pressure is increased at altitude in my mind I can see why the lower mixture would be required to prevent oxygen toxicity. Any links to this question would also be appreciated.
Thanks
Speaking to another LDS, they said I only need to figure the actual depth into the equation and near as I can tell my computer which is supposed to automatically adjust for altitude does not change what it suggest for maximum operating depth at different altitudes.
If anyone can give me a definitive answer I would appreciate it. I would like to have the benefits of diving with a higher mix but being that pressure is increased at altitude in my mind I can see why the lower mixture would be required to prevent oxygen toxicity. Any links to this question would also be appreciated.
Thanks