Compression tests and altitude

[Peter Jackson]

Let me rephrase. Local atm pressure is 12.3 psi, my readings were
170,175,175,175. Would they be different at sea level? If so how would I
correct them mathematically.

Jon Pennington wrote:

> At 02:18 AM 2/10/2002 -0600, Peter Jackson wrote:

> > Will using the actual PSI/14.7 ratio = comp reading/corrected comp ratio
> > and solving for corrected comp work?

> Can you access current barometric data?  This would probably be the