Michael D. Sewell
Monique said:Is there somewhere on the world a beacon which says: this is sealevel? Like there is the Greenwhich timezone, which says: this is t0?
Yes, as a matter of fact, there is. Check with a local surveyor. He or she can tell you where to find a datum point or bench mark.
As mentioned before, GPS is not accurate enough to measure height.
Also, Don't forget about atmospheric tides when using your barometer.
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