The TLE process uses both LLH coordinates as primary inputs — convert each through ECEF, take the difference in NED, then split into eH and eV. Drag the sensor pin in the NE plot below to set the offset graphically.
Slide the truth latitude. Both pins translate together (the same Δlat, Δlon, Δalt stay applied to the sensor). Watch eH change while eV stays fixed — the angular offset is the same, but its metric reach depends on cos(lat).