ACR Electronics NAUTICAST - REV M Manual page 45

After the Ship Settings have been input and saved, this screen appears.
[Exit] takes the user back to the Main Menu.
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N 1 30' E
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GPS Antenna Mounting
It is important to input the exact mounting position of the GPS Antenna on the vessel as this
influences the accuracy of the displayed target in an ECDIS.
(Ref.Points ext:) = The position of any external positioning device (GPS Antenna) used as primary
position source.
(Ref.Points int:) = The position of the GPS Antenna (fallback device in case primary source is
disabled).
After antenna installation, the distance from the sides must be measured and input.
Either the distance from the vessel‟s bow (a) or the stern (b) and starboard (d) and backboard (c) are
required.
e.g. A vessel with the following dimensions:
Length: 220m
Beam: 43m
Input: A: 200 - then press Enter or
B: 20 - then press Enter
C: 10 – then press Enter
D: 33 – then press Enter
Result:
The NAUTICAST™ automatically calculates A+ B and C + D and shows length and beam of the
vessel.
Note: When receiving position data from large vessels, it should be considered that the position
refers to the antenna mounting point upon the vessel. To ensure accurate navigation, the antenna
reference points (see Other Vessels Details) should be taken into consideration when determining
the vessels position.
Also, the electronic chart display in use should be programmed to consider the antenna reference
points. Traffic images are represented in true distances only when all displayed targets, including
own vessel, are working with AIS position information, which considers Antenna reference points.
Y1-03-0203 Rev. M
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0 24' |1>0.10|2>1.30|3>1.80nm
Data saved.
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