Simrad NSO evo3S MPU Operator's Manual page 56

56
Head-up
In head-up mode, the heading line on the PPI is oriented on the 0° on the bearing scale and
towards the top of the screen. The radar image is displayed relative to own ship, and when
the ship turns the radar image rotates.
Ú Note:
Head-up is only available in relative motion mode, and it is the only orientation
mode available if the radar is not connected to a heading source.
North up
In North up mode the 0° indication on the PPI represents north. The heading line on the PPI
is oriented according to own ship heading obtained from the gyro compass. When the ship
turns the heading line changes its direction according to the ship's heading, while the radar
image remains stabilized.
The North up orientation is not available if no heading source is connected to the radar. If
heading data is lost, the system will automatically switch to Head-up orientation.
Course up
In Course up mode, the top of the bearing scale indicates the ship's true course measured
from north at the time Course up was activated. When the ship turns the bearing scale
remains fixed, while the heading line rotates with the ship's yawing and course change.
The Course up orientation is reset by re-selecting the Course up mode.
Radar motion mode
Radar motion is indicated on the upper left corner of the radar panel as either TM (True
motion) or RM (Relative motion).
Relative motion
In relative motion your vessel remains in a fixed location on the Radar PPI, and all other
objects move relative to your position.
You select the position of the fixed location as described in "Offsetting the PPI center" on page 56.
True motion
In true motion your vessel and all moving targets move across the Radar PPI as you travel. All
stationary objects remain in a fixed position. When the vessel's symbol reaches 75% of the
PPI radius (A), the radar image is redrawn with the vessel symbol re-positioned (B) 180°
opposite the current heading bearing.
A
When true motion is selected, the true motion reset option is available from the menu. This
allows for manually resetting the radar image and vessel symbol to its starting position.
Ú Note:
True motion is only available when the PPI is in either north up or course up
orientation mode.
Offsetting the PPI center
You can set the antenna position origin to a different location on the radar PPI. The options
described in the next sections are available.
Radar | NSO evo3S MPU Operator Manual
B