19. Navigation Sensors
19-2
19.2 How to Select Navigation Sensors
The operator can select navigation sensors to use for navigation and view their current values on the Sensors dialog
box. To access this dialog box, put the cursor on the Position field in the information area then push the right mouse
button.
Checkbox status shows whether the sensor is used for integrated navigation or not. If there is no value shown for a
sensor this means that the sensor is not valid. Note that the content of these pages depends on sensors that are in use
on the ship.
19.2.1 Sensors dialog box description
SPD/CRS page
Source: In a multiple workstation environment, verify that the sensor source indicated
at the top of dialog box is the intended one.
Manual speed: If checked, operator can enter value (kn) for speed. (This is used only if
there are no other speed or SOG sensors selected.)
Log: If checked, a log is used as water speed source. "(no pulse)" is used to indicate
that a log device with closed contact relay interface using 200 pulses/nm does not give
any pulses and thus the speed might be wrong. If Log is selected and "no pulse"
condition is detected, then the system generates the alert "405 Log data unreliable".
Note: If you have a dual-axis Doppler log that can measure both water and bottom
track, then installation parameters can be set to receive water tracking as log device.
Dual log (water): If checked, a dual-axis log is used as speed and course source.
"(water)" is used to indicate that this information is from the water track of the dual-axis
log.
Dual log (bottom): If selected, a dual-axis log is used as speed and course source.
"(bottom)" is used to indicate that this information is from the bottom track of the dual-
axis log.
Radar: If checked, radar is used as speed and course source. The following indications
appear to denote source:
(bottom): Log operating in bottom tracking mode.
(water): Log operating in water tracking mode.
(posit.): Position receiver such as GPS.
(manual): Manual speed
(reftgt): Tracked Target
Manual heading: If selected, the operator enters heading manually. Note that this is used only if there are no other
sensors selected.
Gyro1: Heading source is a gyrocompass. "(mag)" means the source is magnetic heading. True heading source has
no indication. If the source of Gyro1 is a gyro with synchro or stepper interface, the indication "(req. set)" appears
when you need to set a new initial value for the gyro.
Note: Magnetic heading cannot be used with the Track Control System.
Gyro2: True heading source has no indication. If you have both gyro1 and
gyro2 selected and their value differs more than 5°, the system generates the
alert "404 Gyro data unreliable".
Rate Gyro: Heading source is a Rate of Turn gyro. "(CALC)" means the
rate of turn is calculated from gyro movement.
Setting initial value of gyro1:
Initial setting of gyro1 is not necessary if it outputs serial data. However, if it is of synchro or stepper type, you will
need to set initial gyro value. If gyro1 requires initial value, then the indication "(req. set)" is displayed. Use the
scrollwheel to enter initial value. After you enter a value "req. set" disappears.
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