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334 · Navigation Sensors
selection Primary or Secondary, then the system generates alarm "4044 Datum change" (alarm numbers are from
4044..4049 depending of position receiver).
NOTE, The ability to check datum of position is a relatively new feature for position receivers. It was introduced in
standard IEC 61162-1 Ed2 Published in July 2000. Only EPFS (for example GPS or DGPS) ,which has "IEC
61162-1 Ed 2 (2000-7)" indicated in their type approval certificate can support the ECDIS to detect Datum
mismatch.
The system generates an alarm "2007 Position discrepancy" if there is discrepancy in position. Together with this
alarm system shows in Pos page of Sensor text "Discrepancy" in red for Position sensor which has position
discrepancy active.
Enable chart align:
If selected, user is able to do a chart alignment by using CHART ALIGN button.
Alignment:
Alignment is selected automatically if user has defined position offset by CHART ALIGN push button. The offset
values are given in Nautical Miles and degrees. If position alignment is used then user is reminded of it every 30
minutes by Alarm "2011 ChartAlign: over 30 min".
Dead reckoning:
The system select automatically Dead reckoning, if there are no valid and selected position sources and if there are
valid and selected speed and course sources. If system has selected Dead reckoning, then the user can enter a new
position for the ship in the LAT. and LON fields.
Kalman filter:
If selected, Kalman filter calculates the estimate of position using simultaneously all valid and selected position,
speed and course sensors. To read more information about Kalman Filter, see "Filter Operation" on page 343