Memory Full—unit memory is full, no further data can be saved.Memory (RAM) Failed Unit Needs Repair—there is an internal problemwith your unit. Contact Garmin Product Support to have the unit serviced.Memory (ROM) Failed Unit Needs Repair—there is an internal problemwith your unit. Contact Garmin Product Support to have the unit serviced.Near Proximity Point—you have reached the distance set for a proximitywaypoint.NMEA Depth is Below Transducer—no keel offset value has been receivedfrom the external sonar device.No Diff GPS Location—RTCM is selected but the unit is not receiving DGPSdata.No Roads Near Destination—the destination for the road route you tried tocalculate is not near any roads. Select a different destination.No Roads Near Starting Point—the start location for the road route you triedto calculate is not near any roads. Select a different start location.No DGPS Position—no differential connection data is available, or not enoughdata is available to calculate a DGPS position.No Tide Stations for that Area—no tide stations within 100 miles of the area.No XM Signal—the GXM 30A antenna is not receiving an XM signal.None Found—no data matched the search criteria.Off Course—you are off course by the distance set in the Off Course Alarm.Proximity Memory Full—no additional proximity waypoints can be saved.Proximity Radius Overlaps—the radius of two proximity waypoints overlap.Route Already Exists—you have entered a route name that already exists.Route Calculation Error—no route can be calculated.Route Memory Full—no additional routes can be saved.Route Truncated—uploaded route from another device has more than 300waypoints.Route Waypoint Memory Full—no additional route waypoints can be saved.Saving XM Program Information—an XM Radio channel lineup change hasoccurred and the unit is saving the channel lineup to memory.Shallow Water—the water is shallower than the amount set in the ShallowWater Alarm.Sonar Failed Unit Needs Repair—there is an internal problem with the unit.Contact Garmin Product Support to have the unit serviced.172 GPSMAP 496 Owner’s ManualAPPENDIX > M ESSAGES