User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 140 / 04 (2011-11)
Operating Instructions
III-2 Common Functions for Navigation
III Main Applications.fm / 10.11.11
III-16
2.1 The Consistent Common Reference System (CCRS)
The NACOS Platinum navigation system is designed as a Consistent Common Reference System (CCRS).
It references all horizontal measurements such as target range, bearing, relative course, relative speed,
closest point of approach (CPA) or time to closest point of approach (TCPA) to one single point on-board,
the Consistent Common Reference Point (CCRP), typically the conning position of the bridge.
The offset between the installation location of a navigation sensor i.e. for position, speed, or heading
and the CCRP is compensated by the Platinum system. The offset between a radar antenna position and
the CCRP is compensated as well. If multiple antennas are installed, there is a provision for applying
different position offsets for each antenna in the radar system. The offsets are applied automatically
when any radar sensor is selected.
The CCRP can be selected by the user, the default setting is the conning position. For precise radar
measurements it can be set to the just selected radar antenna. The relations are shown in the following
two diagrams.
Fig. III / 8 CCRP on RADAR
Measurement relative to the Conning
Position. (CCRP = Conning)
All bearings, distances, positions are indi-
cated relative to the conning position on the
ship´s bridge
Measurement relative to the RADAR
antenna (Bow RADAR as an example)
(CCRP = RADAR)
All bearings, distances, position etc are
indicated as seen from the radar antenna
location.
All different radar antennas on the ship
can be selected as the reference for the
radar CCRP.