North Up, Head Up, Course Up And Repeater Up - Raytheon NSC 18 User Manual

2.3.2.3

North Up, Head Up, Course Up and Repeater Up

This toggle field is used to select either North Up (N UP), Head Up (H UP),
Course Up (C UP) or Repeater Up (R UP) as the orientation of the radar video.
The N UP, H UP, C UP and R UP legend in the upper right of the display shows
the current orientation mode of the radar video, radar rose and SHM display.
Position the cursor on the toggle field and press the Left button. Select the
preferred motion.
Selected by
The North Marker continues mark compass north on the radar rose (red circle).
or
North up means that geographic north is upwards.
−Stabilized operation−
Gyro information is required for N UP operation. When the unit is switched on,
N UP is selected automatically. If the gyro is inoperative, an audible alarm
sounds and the words GYRO OUT appear in the WARNING MESSAGES area.
ARPA functions are disabled and H UP mode is automatically selected.
If N UP mode is selected, 000_ represents compass North (see Figure: 2−22).
Visual impression
The radar video is rotated to a northerly direction. North is at the top (000_). This
effect is comparable with an ordinary sea chart on which North is at the top.
The SHM shows the ship's correct compass heading.
Response to a change of course:
The SHM rotates in line with the change of course.
The radar video remains stationary.
Relative or true
The radar video can be presented in Relative Motion (RM (..)) or True Motion (TM).
Edition: 14.JAN.2005
NSC 18
RADAR
Operator Manual
2−39
R
Raytheon Marine GmbH
Germany
3748DOC020102