Navigate to a waypoint using coordinates: enter latitude/longitude in GPS or FMS, fix format errors, verify the point and fly with or without GPS.
In real-world aviation and flight simulators, enter the latitude and longitude as a user waypoint in the aircraft’s GPS or FMS, verify the format and hemispheres, then activate Direct-To or add it to the flight plan. Before following guidance, cross-check the map position, bearing and distance against the expected location.
In Aviation & Real-World Flying, coordinates define only a geographical point. You still need a known present position, a safe route to the point and, where applicable, clearance to leave your existing route.
Which coordinate format should I enter?
Use the exact latitude/longitude format accepted by your GPS or FMS; the three common formats below represent the same illustrative position.
| Format | Example | Common entry error |
|---|---|---|
| Degrees, minutes, seconds | 51°28′40″N 000°27′41″W | Entering seconds in a field that expects decimal minutes |
| Degrees and decimal minutes | 51°28.667′N 000°27.683′W | Reading the decimal part as seconds |
| Decimal degrees | 51.47778, -0.46139 | Reversing latitude and longitude or losing the minus sign |
Latitude is normally entered first, followed by longitude, but always check the field labels. In signed decimal degrees, north and east are positive while south and west are negative. In a hemisphere-based entry, use N, S, E or W instead of assuming a minus sign will be understood.
Longitude usually needs three degree digits, including leading zeroes. Also confirm the coordinate datum: modern aeronautical systems generally use WGS 84, while coordinates from an older chart or a different mapping system may place the waypoint elsewhere.
How do I enter coordinates into a GPS or FMS?
Create a user waypoint, verify it, then choose Direct-To for an immediate leg or insert it into the flight plan when it must follow the existing route.
- Confirm and convert the format. If necessary, convert DMS to decimal degrees with
degrees + minutes/60 + seconds/3600, applying a negative sign to south or west. Do not round away useful precision. - Create a pilot-defined waypoint. Look for the unit’s user-waypoint, new-waypoint or latitude/longitude entry function. Some FMS units accept coordinates through the scratchpad; others require separate latitude and longitude fields.
- Insert or activate it. Use Direct-To only if you intend to leave the present route immediately. Otherwise, place the waypoint in the correct flight-plan sequence and inspect the resulting legs.
- Cross-check the result. Confirm the waypoint appears in the expected country or ocean area. Compare its initial bearing and distance with a chart or other trusted planning source; a wrong hemisphere can move it thousands of miles.
- Select the correct navigation source. Ensure the CDI or flight director is using GPS/FMS guidance rather than VOR or localiser guidance. If using an autopilot, verify the appropriate lateral mode is armed or active rather than assuming it captured the new leg.
The avionics then calculate course guidance from your changing aircraft position to the stored point. Our explanation of how GNSS and flight-management systems produce course guidance covers what happens behind the display.
A bearing or desired track is not necessarily the heading you should fly. Wind may require a crab angle, and the required heading changes as the aircraft moves. In an actual aircraft, program unfamiliar equipment before a high-workload phase and follow the approved operating procedure for that installation.
Why does the GPS reject my coordinates?
A rejected coordinate usually means the notation does not match the avionics format, although some units cannot create arbitrary latitude/longitude waypoints.
- Wrong units: the box expects degrees and decimal minutes, but the source supplies seconds or decimal degrees.
- Wrong sign or hemisphere: west or south has been entered as east or north, or a parser has been given both a minus sign and a hemisphere letter it does not accept.
- Missing leading zeroes: longitude may require three degree digits, such as
005rather than5. - Invalid minute values: minutes and seconds must remain below 60. For example,
12°60.000′must be normalised to13°00.000′. - Unsupported shorthand: some FMS installations use compressed coordinate notation, but its syntax varies. Do not guess the convention.
- User-waypoint limits: the memory may be full, the identifier may already exist or pilot-defined waypoints may be restricted in that mode.
If the coordinate belongs to a published fix already held in the navigation database, use its proper identifier rather than rebuilding it manually. This preserves the coded route and reduces transcription errors; see our guide to following airways through named fixes and VORs.
Flight simulators add another complication: a world-map coordinate search and the cockpit avionics may accept different formats, and a custom map pin may not transfer as an editable pilot waypoint. For a practical example, we explain setting a destination from latitude and longitude in Microsoft Flight Simulator.
Can I navigate to coordinates without GPS?
Yes, but you must know your present position and calculate or plot a course from that position to the destination coordinate.
Plot both points on a suitable chart, determine the true course and distance, apply magnetic variation where required, then correct the heading for wind. Monitor elapsed time, fuel and position using visual landmarks or radio-navigation aids. One minute of latitude is approximately one nautical mile; a minute of longitude becomes progressively shorter away from the equator.
For a long leg, the shortest great-circle route does not maintain one constant heading, so use intermediate waypoints or recompute the course as required. Coordinates alone provide no terrain, obstacle, weather or airspace protection.
Does a coordinate waypoint change my ATC clearance?
No. Creating or activating a coordinate waypoint does not authorise an aircraft to leave its cleared route, enter controlled or restricted airspace, or disregard altitude and procedure constraints.
Under IFR, do not reconstruct a SID, STAR or instrument approach from manually entered coordinate points. Use the published procedure from the approved navigation database, and accept direct routing only when properly cleared and operationally safe.
Coordinate waypoints are common on routes without nearby ground-based aids, particularly over oceans. They demand careful entry and independent cross-checking; our coverage of oceanic waypoint navigation and fuel planning explains the wider procedure.