An interesting function could be added to our EFIS.......a feature which will record the info. to build take-off data to customize our own table of take-off performance.
Our baro. pressure is entered as our normal procedure, OAT is measured and recorded so we will have density altitude.
With WAAS GPS built in or interfaced to the EFIS couldn't a distance be determined when an altitude change is detected?
A button push could tell the EFIS our starting point.
Something like this could help us gather very accurate info to develop our POH.
Glenn Wilkinson