User's Manual

Table Of Contents
ED 3100 G 140 / 04 (2011-11)
Operating Instructions
III-3 Permanent Area for Navigation
III Main Applications.fm / 10.11.11
III-29
NACOS Platinum
3.1.5 Screen Stabilisation
As far as the screen stabilisation is concerned, there is a choice between
the following:
- True Motion (TM):
The radar video of not moving targets (buoys, beacons, land or
lighthouses) is fixed; the own ship symbol moves across the
screen. The PPI/chart area orientation is North-Up or Course-Up.
Either manually, or automatically by means of a TM reset, the
own ship symbol on the PPI/chart area is reset in good time before the PPI/chart area boundary is
reached; this resetting is done in such a way that the larger part of the PPI/chart area lies ahead
of own ship.
For the ECDIS application, the TM reset
takes place in the instant that the indica-
tion of the CCRP has reached a distance of
10% up to 70% of the chart diameter from
the centre of the PPI.
For RADAR, the value is not adjustable.
See chapter A - 4.1 on page A-34 for
details.
The appropriate value for ECDIS True
Motion Reset value can be set by means
of the slider in the ECDIS > Settings >
True Motion dialog:
- Relative Motion (RM):
Own ship's position is fixed; the radar video moves relative to own ship in accordance with the
movement of own ship. As far as the PPI/chart area orientation is concerned, it is possible to choose
between Head-Up, North-Up and Course-Up.
Centre of the PPI/
chart
10% - 70% of the
radius
Light grey area:
The area where
the off-centered
CCRP or position
indication of the
radar antenna
may be located.