Furuno FEA-2107-BB Operator's Manual page 340

19. Navigation Sensors
Enable:
Check to align chart, using the "drag and drop" feature.
Chart alignment:
Alignment is automatically chosen if the operator has defined position offset by using the chart align feature. The
offset values are given in nautical miles and degrees. If position alignment is used, the operator is reminded of it
every 30 minutes by the alarm "2011 ChartAlign: over 30 min".
Dead rec:
The system automatically chooses dead reckoning if there are no valid and chosen position sources and if there are
valid and chosen speed and course sources. If the system has chosen dead reckoning, then the operator can enter a
new position for the ship in the Lat and Lon fields.
Kalman filter:
The Kalman filter calculates estimated position using all valid and chosen position, speed and course sensors.
Choose On to activate this feature.
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