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Go to garmin.com/manuals/echomapplus60-70-90. Acquiring GPS Satellite Signals. The device may need a clear view of the sky to acquire satellite signals. The My Garmin 54 DV , reads correct sonar while stationary . When in motion , the display continually displays the last reading from staionary position .You can use blank memory cards to record. Garmin Quickdraw™ Contours mapping, record sonar (with a compatible transducer), and transfer data such as waypoints.