User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 140 / 04 (2011-11)
Operating Instructions
III-3 Permanent Area for Navigation
III Main Applications.fm / 10.11.11
III-34
3.2.1 Integrity Marking of Sensors
According to the currently valid peformance standards, invalid information or information with low integ-
rity shall be clearly marked qualitatively and/or quantitatively. In NACOS Platinum a qualitative marking
of sensors by alarm icons is used
1)
.
For this purpose the main navigation sensors used for the instruments in the permanent area are contin-
uously monitored by the system. If the signal of a sensor is no longer received or is corrupted, or if it
is marked invalid by the sensor itself or by the NACOS internal sensor monitoring, a respective "sensor
timeout" or a "sensor invalid" alarm message is given for the faulty sensor
2)
.
In case of activated AUTO selection mode another connected sensor (if available) can automatically by
connected to the respective instrument and the instrument data remain available and valid.
If this is not possible, or if the manual selection mode is used, the sensor will be marked invalid
by an alarm icon shown before the sensor label in the instruments displayed on the permanent
area.
This can happen for the HDG, STW SOG and COG labels in the Heading & Speed group and for the posi-
tion data in front of the LAT and LON labels.
If the manual input mode is selected (caused by sensor failure or decision of the operator) and
the manually set data are used for any navigation sensor, this will be shown by the icon, which
is indicating manual input mode and additionally the warning level 3.
On a vessel at sea manually set sensor data are generally to be treated as doubtful and with low integrity
as they must permanently be monitored and adapted to the real situation by the operator.
1)
For a complete list of available alarm icons refer to chapter see chapter V - 1.1 on page V-4.
2)
If you need more detailed information about the sensor modes, valid/invalid marking or other details of the
different sensor interface protocols, refer to the Technical Manual delivered with the system.