Navigation PPLintermediate

Arrange the steps for computing an estimated arrival time from a route leg.

Answer

Determine the leg distance., Determine groundspeed, accounting for wind., Divide distance by groundspeed to obtain elapsed time., Add the flight duration to the departure time.

Explanation

ETA calculation starts with route distance and groundspeed. Divide distance by GS to get elapsed time, convert it to the required clock units, and add it to the departure time. For example, a 75 NM leg at 100 kt takes 0.75 hours, or 45 minutes.\n\n**Key takeaway:** ETA is departure time plus distance divided by groundspeed.\n\n**Glossary:** **ETD**: estimated time of departure; **ETA**: estimated time of arrival.

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