Infact the "calibration" just checks altitude and TAS.
Using E6B you can actually match your TAS to your calibration...rather than the other way round.
so
Open E6B and position it so the TAS is just below youir cross hairs
get your line on target
stabalise speed a little bit
calibrate
Now with your throttle match your E6B TAS to your calibrated speed.
Insert bomb in pickle barrel from 30 k.
