An n-vector of position A.
An n-vector of position B.
Depth of position A in meters, relative to the ellipsoid.
Depth of position B in meters, relative to the ellipsoid.
A reference ellipsoid.
Coordinate frame in which the vectors are decomposed.
Position vector in meters from A to B, decomposed in E.
Delta finds a delta ECEF position vector from a reference n-vector position, and a target n-vector position.