Messages
Accuracy Alarm
—the GPS accuracy has fallen outside of user-set value.
Alarm Clock
—the alarm clock has sounded.
Antenna Shorted to Ground
—the external GPS antenna has an electrical
connection problem. Contact Garmin Product Support.
Approaching Turn
—you are nearing a turn in a route.
Arriving at Destination
—you are nearing your destination.
Batteries Low
—the battery needs to be recharged.
Basemap Failed Unit Needs Repair
—there is an internal problem with your
unit. Contact Garmin Product Support to have the unit serviced.
Boat Is Not Moving Fast Enough to Calibrate
—the boat is not moving fast
enough for the speed wheel to provide a valid speed.
Can’t Unlock Maps
—no applicable unlock code for one or more maps was
found. All MapSource maps are not accessible.
Check XM Antenna
—internal problem with your GXM 30 antenna. Contact
Garmin Product Support.
Database Error
—internal problem with the unit. Contact your dealer or
Garmin Product Support to have the unit repaired.
Deep Water
—the water is deeper than the amount set in the Deep Water
Alarm.
Detail Maps Don’t Support Routing
—maps that are loaded on the data card
do not support automatic route calculation.
Distress Call
—a DSC distress call was received. Take appropriate action.
Dragging Anchor
—the distance set in the Anchor Drag Alarm was exceeded.
Drift Alarm
—the water depth has changed by the amount entered in the Drift
Alarm setup.
Fish Alarm
—a fish was detected. The unit shows an icon and beeps (if
enabled). This alarm does not show a message banner.
Flash Flood Warning
—a flash flood warning was issued for the area by the
National Weather Service.
Flood Warning
—a flood warning was issued for the area by the National
Weather Service.
Lost Satellite Reception
—the unit is unable to receive satellite signals.
Marine Warning
—a marine warning was issued by the National Weather
Service.
Memory Full
—unit memory is full, no further data can be saved.
Memory (RAM) Failed Unit Needs Repair
—there is an internal problem
with your unit. Contact Garmin Product Support to have the unit serviced.
Memory (ROM) Failed Unit Needs Repair
—there is an internal problem
with your unit. Contact Garmin Product Support to have the unit serviced.
Near Proximity Point
—you have reached the distance set for a proximity
waypoint.
NMEA Depth is Below Transducer
—no keel offset value has been received
from the external sonar device.
No Diff GPS Location
—RTCM is selected but the unit is not receiving DGPS
data.
No Roads Near Destination
—the destination for the road route you tried to
calculate is not near any roads. Select a different destination.
GPSMAP 378/478 Owner’s Manual
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