B737-300 Pressurisation question
Assuming departure and destination at sea level. Passing 10,000 ft on climb to 35,000 ft what would the cabin altitude indicate, assuming normal pressurisation mode (auto). On passing (say) 18,000 ft climbing what would be the cabin altitude?
Reason for asking is simulator fidelity check. One simulator I know does not indicate more than 1000 ft cabin altitude while passing 18,000 ft in climb. Is this normal? Is there a formula or rule of thumb to know cabin altitude versus actual altitude at any point in a climb - or descent?