Garmin GTN 750 Cockpit Reference Guide - Page 52

Message Description Action LOCKED FLIGHT PLANCannot activate a flight plan containing a locked waypoint. The user is trying to activate a flight plan that contains a locked waypoint. Unlock the flight plan by modifying stored flight plans as necessary to include waypoints, procedures, and airways that are in the current navigation database. LOSS OF INTEGRITY (LOI)Verify GPS position with other navigation equipment. The GPS module has reported a loss of integrity. Use a different GPS receiver or a non-GPS based source of navigation. Contact dealer for service if this message persists. MAGNETIC VARIATION- MagVar is flagged as Verify that the geographical Aircraft in area with unreliable in the MagVar region supports navigation large mag var. Verify all database. This normally based on magnetic variation. course angles. occurs when operating at high latitudes that do not support a NAV Angle of Magnetic. NAV ANGLENAV Angles are referenced to True North (T). NAV angle is set to True. No action is necessary; message is informational only. NAV ANGLENAV Angles are referenced to a User set value (U). NAV angle is set to User. No action is necessary; message is informational only. NON-WGS84 WAYPOINTSee CRG. Location may be different than where surveyed for [WPT]. The active waypoint is not referenced to the WGS84 datum. See Note 1 following this table. No action is necessary; message is informational only. Messages 46 GTN 725/750 Cockpit Reference Guide (CRG) 190-01007-04 Rev. B