Definition
A user-defined waypoint created in an RNAV (area navigation) system by specifying a bearing and distance from an existing reference point — typically a VOR or other navaid — rather than by entering latitude and longitude. The waypoint exists only in the navigation database the pilot has built; it has no published name and no physical ground station beneath it.
Plain English
A point in space that the pilot creates by telling the navigation computer 'go this far in this direction from that station.' The point is not on any chart and there is nothing physically there — it only exists inside the avionics.
Context Anchor
Seen in RNAV, GPS, and flight management system discussions where a pilot or system creates user-defined waypoints instead of using only published charted fixes.
Derivation
Offset' means displaced from a reference. 'Phantom' is used because the waypoint has no real-world presence — no station, no marker, no charted symbol. It exists only in the navigation system's memory.
Why Pilots Care
Enables custom routing for traffic separation, obstacle avoidance, or parallel offset procedures without published fixes.
Grounding Statement
Picture placing a dot on the GPS screen two miles to the right of a known fix; that dot can be used for navigation even though nothing is actually located there.
Intuition Check
“Offset” does not mean a mistake here; it means intentionally placed away from a reference. “Phantom” does not mean imaginary and useless; it means computed by the navigation system, not physically marked or published as a normal fix.
Example Sentence 1
The pilot built an offset phantom waypoint 15 nautical miles north of the VOR to set up a custom holding fix clear of the airway.
Example Sentence 2
Using the FMS, the crew defined an offset phantom waypoint three miles left of the airway centerline.