29. Steering With YOKOGAWA Autopilot PT-500A
29-7
29.4.6 Route steering alarms
The alarms relevant to the Steering are of two types (permanent and intermittent).
Permanent alarms below are available regardless of the steering
mode used:
Outside Channel
red color of the "Off track" value
orange color text "Outside Channel"
Out of Gate is indicated by orange text. Out of gate indicates
that, if your ship continues using the current course, then your
ship will be outside of the channel at wheel over point.
Permanent alarm below is available only during route steering
mode:
Rate of Turn Limit is indicated by orange text
Intermittent audio/visual alarms appear as follows:
• visual alarm and buzzer is located in ECDIS control unit.
• alarm number and text is visible on the lower right corner of the ECDIS display (see example below)
Typical intermittent alarms not described in other sections are:
Alarm "2455 Route: off course" appears when the system needs more than a set limit (the limit is available in
Installation parameters) to keep the track. This alarm is repeated every 5 minutes, if the condition continues.
Alarm "2456 Route: WP approach error" appears when, when decreasing speed, for example, your ship is at the
point "waypoint approach alarm time + 100 seconds" away from the wheel over point after the operator has
acknowledged alarm "2451 Route: WP approach alarm" to enable the next automatic turn. After the alarm 2456 the
next turn is not enabled and the system will generate a new alarm "2451 Route: Wp approach alarm" when
appropriate.
Alarm "2457 Route: Outside chl limit" appears when your ship is outside the planned channel.
Alarm "2460 Pilot: ROT will be exceed" appears when the set radius value together with the current speed of the
ship request rate of turn which is over the limit set in the Route Parameter Max. rate of turn.
Alarm "2461 Route: ROT will be exceed" appears when the planned radius for next waypoint 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. This
alarm is activated if your ship is within value WP approach alarm time set in the Route Parameters from the wheel
over point.
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