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Changes since release 04.01 · 1
Changes since release 04.01
Overall operation related changes
Following alarms have been made available for recording into the Voyage log:
· 2007, 2008, 2009, 2010, 2013, 2478, 2480, 2488, 2489, 2492, 2493, 2494, 2495, 2496, 2497 2498, 2498, 2501,
2503, 2504, 2505, 2506, 2507, 2509, 4027, 4028, 4029, 4030, 4031, 4033, 4034, 4036, 4037 and 4055
Following alarms have been removed from recording into the Voyage log:
· 2471 and 3201
Changed behaviour for following alarms
· Alarm "2010 Filter: Pos source change" : Kalman Filter and two GPS. Before change alarm 2010 was activated
also if only one DGPS lost differential signal. After change alarm 2010 is activated for above case only if
positions of two GPS separates more than 30 meters. The new behaviour remove unnecessary alarms for short
periods of lost DGPS, if there are no other consequences than lost differential mode.
· Alarm "2013 SOG COG unreliable"
· This has been too aggressive in rough sea condition (for ex. 40-50 separate alarms per 4 hours
period). After change the alarm condition lasts for 10 minutes, if second alarm occurs within 10
minutes. This will change separate alarms as one long alarm condition.
· This has been problematic for fast vessels and fast manual manoeuvres. Logic has been changed:
Alarm is not generated, if autopilot is not used or it is used in Heading Control mode. Vessels with
fast manoeuvres ("Max rate of turn" limit > 150 deg/min) use increased detection level for COG/SOG
unreliable condition.
AIS and ARPA targets viewing limitations
· Before change common limit for AIS and ARPA targets displayed on top of chart was 1:1 000 001 both for
ARCS and S57 charts. This was a problem for Ocean areas with ARCS charts, because large enough ARCS
charts were not available. After the change ARCS has display limit set so that AIS and ARPA targets are
displayed on top of the largest scale Ocean charts (original scale 1 : 3 500 000) when they are zoomed to
overscale.
AIS target data display
· Repeated messages received from shore station, following rules apply:
· If direct message from a target is not received then repeated message can be accepted.
· If direct message from a target is received then repeated message is not accepted.
Activation of Kalman Filter
· New behaviour includes a reset to position before activation of the Kalman Filter. This removes possibility that
own ship position jumps a lot after activation of Kalman Filter.
Changed Wind indication
· Before change the system indicated "True Wind" value based on the standard IEC 61162-1. After change the
system indicates "True Wind" as commonly understood by mariners. In practise old mode indication NORTH
and TRUE are replaced by indications TRUE and RELATIVE.