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5 votes
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Do GPS coordinates of a fixed point in space ever change?

The coordinates of a fixed point on earth do change, but they do change very slowly. WGS84 is a coordinate system. It is based on an ellipsoid that approximates Earth's shape. The surface of the ...
DeltaLima's user avatar
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4 votes

Do GPS coordinates of a fixed point in space ever change?

Does the GPS coordinates of a point fixed in space change with time? The GPS uses a coordinate system which is Earth-centered and Earth-fixed (ECEF). Coordinates are fixed to the average Earth (...
mins's user avatar
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4 votes

Do GPS coordinates of a fixed point in space ever change?

Conceptually, yes they change over time with respect to locations on the earth. Older mapping used a global model that assumed a static coordinate system, tied to the globe in one place (prime ...
BowlOfRed's user avatar
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4 votes
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Why was the rate of part 121 LPV equipage projected to be so low, and has that projection come true?

Short answer: Money. Part 121 operators, i.e. airlines, are interested in profit and running an airline is a low margin business. Aircraft are very big capital expenses. They cost a lot every day in ...
Gerry's user avatar
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2 votes
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Can I fly a SID/STAR if a navaid is NOTAMed inoperative, using RNAV?

This is legal in the United States, per AC 90-108. GPS can be used in lieu of NDB or DME in most cases. One of the exceptions is when the procedure is NOTAMed as not authorized. But this applies to ...
Chris's user avatar
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