Table of Contents
Advertisement
Radar steering available from selected ARPA radar models
Selected ARPA radar models has "Enter New Course", "Radius Up" and "Radius Down" pushbutton. New set
course is set by using the EBL of the ARPA radar or trial manoeuvre of the ARPA radar.
Radar steering is possible when you have selected Program Track Turn mode from the Trackpilot panel.
Intermittent alarms which are related with Radar Steering available with some selected ARPA radar models.
Alarm "2450 Set radius limit exceeded", which appears as when the system has got a request to set radius up or
down and the value of the radius is already at highest or lowest value.
Alarm "2462 Trial: ROT will be exceed", which appears, if the set radius value in the ARPA radar for trail
manoeuvre together with the current speed of the ship request rate of turn which is over the limit set in Route
Parameter Max. rate of turn.
Alarm "2473 Radar set course executed", which appears as confirmation when the system has accepted a new turn
from the ARPA radar. This alarm gives only a short beep and disappear automatically.
Alarm "2479 Radar set radius executed", which appears as confirmation when the system has accepted a new
radius from the ARPA radar. This alarm gives only a short beep and disappear automatically.
Alarm "2474 Disabled: Steering off", which appears, if a radar steering related set course or set radius request form
the ARPA radar has not been accepted by the system because the request did not come from Master ARPA radar.
Alarm "2486 Disabled: Steering off", which appears, if a radar steering related set course or set radius request form
the ARPA radar has not been accepted by the system because the radar steering was not enabled from the Trackpilot
panel. You enable radar steering from trackpilot panel by selecting Program Track Turn mode.
Notes
When Track pilot is not used for steering
Outside the track pilot there is steering selector with at least "HAND" and "TRACK PILOT" selections. "HAND"
can be override tiller, direct rudder pump operation push-buttons, non follow up rudder control or follow up rudder
control. While in "HAND" mode the track pilot sets always his set course equal to gyro course.
User can change to "HAND" mode from any track pilot modes.
Steady as she goes
If the user wants that the ship should go "steady as she goes" while in the middle of any track pilot operation, he
switch from any Track pilot mode to "HAND" mode (and back again if he likes to continue with track pilot control).
About mode changes when using Track pilot for steering
The user can change from any mode to any other mode. It is possible to leave automatic route steering and resume
back to automatic route steering during both linear parts and turns.
The new mode continues from the previous displayed course in set course numerical display. The only exceptions
are pending program modes (PROGRAM COURSE CHANGE and PROGRAM TRACK TURN) when the new
mode continues from currently used set course value. These pending modes are indicated by flashing light in
START COURSE CHANGE push-button.
However PROGRAMMED TRACK TURN differ from other course changes in a following way:
•
it is possible to design a PROGRAMMED TRACK TURN on top of an ongoing automatic route steering. This
is to have the designed course change displayed on the radar screen. The course change (and mode change) is
however activated only, if the user pushes START COURSE CHANGE. While designing a course change on
top of route steering the tiller can off course used to set design course.
•
it is also possible to design a similar course change on top of an ongoing turn (route or normal course change).
In this case the difference to previous case is that radar designed course change display (= curved ebl) is already
used to display ongoing turn. The course change (and mode change) is however activated only, if the user
pushes START COURSE CHANGE. While designing a course change on top of route steering the tiller can off
course used to set design course.
•
lamps PROGRAM TRACK TURN, TRACK and TURN are on besides the lamps for the ongoing mode.
Steering with EMRI Trackpilot • • • • 377
Advertisement
Table of Contents
