What do you input in a navlog for wind direction and velocity, when the wind and temp forecast says 9900+18? I know 9900 means light and variable winds less than 5kts but how do I determine the average wind direction to use for my navlog?
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1$\begingroup$ Welcome to aviation.SE! $\endgroup$– PondlifeAug 23, 2018 at 21:50
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3$\begingroup$ Why not just consider the winds effectively calm? If you want to be conservative, give yourself a 5kt. headwind. $\endgroup$– abelenkyAug 23, 2018 at 22:01
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2 Answers
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Light and variable means there's no meaningful windspeed or direction, so you can just ignore it. For planning purposes, you can simply plan as if the wind was calm.
But, it's very possible that the winds will actually be stronger and more directional than forecast. You should check your actual track and times against what you planned, and adjust your navlog in flight as needed. That's one of the cross-country navigation skills that pilots are expected to learn.
answered Aug 23, 2018 at 22:03
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The best technique when planning your flight is to assume a 15knot headwind ALL the time. This allows for climbs, descents, and delays, and works quite nicely.
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3$\begingroup$ "Best technique"? Maybe the easiest, but hardly the best. $\endgroup$– abelenkyAug 24, 2018 at 12:02