This GTA is a drift chart, it’s scale uses a 90-degree angle to measure the ascent of the PIBAL. Pathfinders use the drift scale to compute the mean effective wind.
NOTE: This document is in PDF format
This GTA is a drift chart, it’s scale uses a 90-degree angle to measure the ascent of the PIBAL. Pathfinders use the drift scale to compute the mean effective wind.
NOTE: This document is in PDF format
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