Pressure altitude
(Standard pressure - current pressure) * 1000 + field elevation
Density altitude
120 * (OAT - standard temp)
Feet per NM to feet per min
FPNM * GS / 60
VDP (distance)
a. VDP (time)
MDH / 300 (in NM from threshold)
a. MDH / 10 (in sec to subtract from FAF to MAP)
Maneuvering speed
Va @ max gross wt * square root of (current wt / max gross wt)
Rate of descent for a 3 degree glide path
VS = GS * 5
Top of descent for a 3 degree glide path
Altitude to lose / 300
Standard rate turn angle of bank
(KTAS / 10) * 1.5
Distance off course of VOR
200ft per dot per NM from the VOR