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Primary and Secondary position of own ship
The system has three different positions for own ship: System position, Primary position and Secondary position:
•
System position, which is used for navigation and steering. See chapter "Source of position" on page 301.
•
Primary position, is the position of sensor which is selected as a primary position source.
•
Secondary position, is the position of sensor which is selected as a secondary position source.
The source of Primary position of the own ship is position sensor, which has been selected either as Primary or as
Pri no alarm.
The source of Secondary position of the own ship are position sensors, which have been selected either as
Secondary or as Sec no alarm (see figure below). Secondary position of the own ship is not available as
latitude/longitude value for the user.
GPS in diff. mode
or SYLEDIS
selected as
SECONDARY
Any other than
Not selected
GPS in diff. mode
or no position
or SYLEDIS
selected as
SECONDARY
Not selected
or no position
System, Primary and Secondary position of the own ship are available as past tracks on ECDIS screen. You can
control their visibility from Tracking sheet of Chart Details (see example below where "Ship System" has been
selected to be displayed).
Position discrepancy alarm
Based on Primary and Secondary positions of the own ship you can activate alarm "2007 Position discrepancy".
The alarm is active only if both Primary and Secondary positions of the own ship are valid and if the limit value is
non zero. You can set the limit for alarm from Initial Settings (see below).
302 • • • • Navigation Sensors
Selected and position exist
Selected and
position exist
Secondary position
of the own ship
is not valid
Secondary
Position
of the
own ship
used by
the system
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