Enabling Omni-bearing Selector (OBS) Mode suspends the automatic sequencing of waypoints in a GPS flight plan, but retains the current “active-to” waypoint as the navigation reference even after passing the waypoint. ‘OBS XXX°’ is annunciated in the FMS status box below the HSI when OBS Mode is selected. While OBS Mode is enabled, a course line is drawn through the “active-to” waypoint on the moving map. If desired, the course to/from the waypoint can now be adjusted. After releasing OBS Mode, the GPS flight plan returns to normal operation with automatic sequencing of waypoints, following the course set in OBS Mode. The flight path on the moving map retains the modified course line.