400' above take off point or ground?

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OK, I've done a search, but didn't find a clear answer: Is the FAA 400' max altitude for above the take-off point or above ground level?

Today I flew well above 400' take-off level but was never more than 200' above ground level (Flying up and down a tall hill-side).

Any thoughts?
 
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It's 400 feet above ground level (the ground beneath your Phantom).
 
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OK, I've done a search, but didn't find a clear answer: Is the FAA 400' max altitude for above the take-off point or above ground level?
Because the point you launch from is not related to where you are flying, your height above launch point is irrelevant.
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Remember what the 'spirit' of the recommendation from the FAA is.... to maintain a 100 ft vertical buffer between hobbyists and manned aircraft.

The manned aircraft also have restrictions and they will generally maintain their altitude based on the highest object in the area be it mountain, tower, building, etc.
 
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