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CyScan Positioning System • Installation and Maintenance Guide r1.1
GCS
GCS
Example 3 - Ship moving round the corner of a fixed platform
B
1
2
3
4
24
0
5
A
Reflector Positions
1
A=+11.21m, B=+28.56m, orientation=156
0
2
3
4
5
A=+5.12m, B=+16.00m, orientation=156
A=0, B=0, orientation=201
A=+36.94m, B=-17.75m, orientation=246
A=+52.57m, B=-24.01m, orientation=246
0
0
0
0
CyScan's Position
(NMEA-$RLS convention)
A
B
= -44.456m
= -38.032m
Heading = 302
0
Notes:
1 The DP system will display the Origin of the A and B axes. This could be any point on the
tanker. In this example it is number 3 reflector at the south-west corner of the platform.
2 The reflector numbering should be chosen so that they form an anti-clockwise sequence
when seen by CyScan.
3 If the reflector positions are in northings and eastings, CyScan gives the ship’s position in
northings and eastings and gives the heading relative to true north.
4 The DP system will display the corner of the platform since that is at the origin of A & B.
5 The ship can move round the corner of the platform without any interruptions in CyScan’s
reception.
6 This location could not be auto-surveyed as not all targets can be in view at all times,
because it contains more than 4 targets (the limit of the auto-survey) and the targets are not
facing the same orientation or are indeed aligned with each other.