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6th January 2017 | 12:02

#20 (permalink)

Sanger

Joined: Jan 2017

Posts: 9

Likes: 0

From: UK

Spot on, do believe I have it!

On aviation charts they list the AMSL of obstructions however how do they know that a mast is 300ft AMSL if the pressure is fluctuating each day?

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