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15. Navigation Sensors
2-5
2.4 Presentation Modes
2.4.1 Presentation modes
This radar has the following presentation modes in the radar mode:
Relative Motion (RM)
Head-up: Unstabilized
Head-up TB: Head-up with compass-stabilized bearing scale (True Bearing) where the bearing scale rotates with
the compass reading.
Course-up: Compass-stabilized relative to ship’s orientation at the time of selecting course-up.
North-up: Compass-stabilized with reference to North.
True Motion (TM)
North-up: Ground or sea stabilized with compass and speed inputs.
Choosing presentation mode by keyboard
Push the MODE key consecutively to select radar presentation mode desired. The PRESENTATION MODE box
shows the current presentation mode.
Choosing presentation mode by trackball
1. Use the trackball to select the PRESENTATION MODE box at the top left corner of the screen.
2. Push the left button to select mode desired.
Loss of gyrocompass signal
When the compass signal is lost, alert "705: Gyro error" or "706: Gyro error" appears. After timeout, the alert
"402: No heading available" appears, the presentation mode automatically becomes head-up, and all TT and AIS
targets are erased. Check the gyro and select the presentation mode with the MODE key or the PRESENTATION
MODE box.
2.4.2 Description of presentation modes
Head-up mode
The head-up mode is a display in which the line connecting own ship and the top of the display indicates own ship’s
heading.
The target pips are painted at their measured distances and in their directions relative to own ship’s heading.
The short line on the bearing scale is the north marker, which indicates heading sensor north. A failure of the
heading sensor input will cause the heading readout to disappear, and the message "No heading available" or "Gyro
error" (message in red) appears at the lower right corner of the screen.
Heading Line
North Marker
When the display is off centered
the heading line appears at 0 degree.
Head-up mode