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Just worked that out myself. Havent had to do density alt calcs for 15 yrs so a bit rusty.
How I passed my met exam is a wonder, I must have copied off a flap nerd. 120 was used for something when...

I use 2 degrees per thousand ft and 1 hpa per 120 ft. They are the standard ISA lapse rates used in aviation.


Sent from my iPhone using Tapatalk. So please forgive my sausage fingers!!!

I just input mine manually every day before I need it, I double check it a different times of the day. I use my kestral and gps to confirm for all the info required. Far more accurate than a weather...