Advanced Navigation Calculations
PNR & ETP Calculator
Required calculations for CASA / FAA commercial navigation exams. Determine your Critical Point (ETP) and safe Point of No Return (PNR).
Route Details
Exclude reserves
Ground Speed Data
Navigation Points
Point of No Return (PNR)
Time to PNR
2h 3m
Distance to PNR
245 nm
Equitime / Critical Point (ETP)
Time to ETP
1h 8m
Distance to ETP
136 nm
Converge & Diverge: Winds will cause your ground speeds to differ heading out versus returning home. ETP determines the equal time point between destinations, whereas PNR tells you the absolute boundary limit for returning safely to departure base before fuel exhaustion.
