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Steve schrieb:
> 1) I know how wrong dive tables are, and I've thrown out my USN long ago in

?Steve, in Europe we have Buehlmann tables for altitude diving.


> favour of planning my dives using software.  Is there some 
tables were created with software , too.

general rule of
> thumb I should follow instead of plugging my altitude into the software?

Depends on yr software. What it needs -and- should be able to work with,
is the ambient barographic pressure at your altitude level.
For calculating the stops , you should know about the specific way your
depth gauge reacts to diminished barogrophic pressure. 

Diving at a different barographic pressurre means a change of the
relation ambient pressure / surface pressure. In altitude, the lesser
surface pressure means a higher ratio, so that any depth changes imply a
greater pressure change than at sea level.
Same applies to  a depth gauge with a sealed chamber/ membrane assembly.
If you have a gauge which allows equalization of the behind membrane
compartment with ambient pressure, this will give the the right ratios (
not depth) when diving. You need to adjust the zero starting point as
well, of course. Equalization means to get the right compliance of the
gauges rear chamber .
Some computers just do it right.

> 
> ie add 5ft to your depth for every 2000ft above sea level - or something
> similar

better go for the correct pressure ratios.



 
> 2) I've heard that once arriving to altitude, it is best to spend 12-24 hrs
> at that altitude before diving, so your body gets acclimatised.  I suspect
> that this is crap, but I'd just like to confirm.

Your hearsay is right. Climbing means decompression. Any dive following
a climb is a second dive ! 


> 
> 3) At what height should I start altering my profile.

This depends on which height your normal tables/ program is intended
for. 
Standard Bühlmann tables afford a change at 2000 ft.


Regards

Matthias
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