Diving with altitude of more than 300M

[boulderjohn]

Question. I know you have to have a different set of tables. Can you get them at the LDS, or order them easily?

You can usually get a separate table in slate form at your LDS. If you get the Adventures in Diving book (PADI), it is within it, in the Altitude diving section. I assume all other agencies must have it in their equivalent training materials.

 

[Coldiver1]

I dive at Lake Tahoe,which is at an elevation of 6,230 feet. If I am going to do multiple dives that day I consult the "altitude adjustment table" and we round up to a 7,000 foot dive and that in turn increases your depth as shown be the messages prior to this one. The tricky part is (and I haven't taken the altitude course) that the drive from Reno to Tahoe takes me over a pass that sits at 8,900 feet at its highest point and I pass it again on my way home. I have been told that I also have to take this into consideration which is a difference of 2,670 each way. I'm not sure how I calculate this into the plan so if anyone knows-chime on in. Most people I dive with do not include this extra calculation, and as far as I know we haven't been hurt yet.

 

[boulderjohn]

I dive at Lake Tahoe,which is at an elevation of 6,230 feet. If I am going to do multiple dives that day I consult the "altitude adjustment table" and we round up to a 7,000 foot dive and that in turn increases your depth as shown be the messages prior to this one. The tricky part is (and I haven't taken the altitude course) that the drive from Reno to Tahoe takes me over a pass that sits at 8,900 feet at its highest point and I pass it again on my way home. I have been told that I also have to take this into consideration which is a difference of 2,670 each way. I'm not sure how I calculate this into the plan so if anyone knows-chime on in. Most people I dive with do not include this extra calculation, and as far as I know we haven't been hurt yet.

You treat it as a flying after diving scenario.

Flying after diving is based on an increase in altitude of 2,000 feet or more. This qualifies, so it is the same as stepping on a plane.

 

[knotical]

I'm not sure how I calculate this into the plan so if anyone knows-chime on in.

Treating it as flying after diving can be a bit restrictive. A couple of other methods are discussed in this thread:
http://www.scubaboard.com/showthread.php?t=86431

Of the methods mentioned, I no longer like the technique of treating all your dives as if you’re at your maximum altitude. The problem is that you’re then essentially doing a very shallow “dive” of many hours duration.

 

[JohnW]

Remember there are also modified Saftey Stop Depths :

1000ft 14ft
2000ft 14ft
3000ft 13ft
4000ft 13ft
5000ft 12ft
6000ft 12ft
7000ft 12ft
8000ft 11ft
9000ft 11ft
10000ft 10ft

 

[altitudemike]

Nice to see another canuck from oil country on the board. Have you dove the town site yet?