2. INLAND AIS OPERATION
2-13
SCALE tab
The SCALE tab is only displayed for SAR VESSEL, SAR AIRCRAFT and AtoN target
types.
QUALITY tab
The QUALITY tab is displayed for all target types.
Contents Description
SHIP SIZE(LENGTH, BEAM) Target’s ship size (length, beam). Displayed for all above target
types.
ANT POSN(X,Y) Position of target’s antenna. Displayed for all above target types.
DRAUGHT Target ship’s draught. Displayed only for CLASS A target types.
PI Target’s position. Displayed only for AtoN target types.
CONVOY Target’s convoy length and beam.
Contents Description
PA Position Accuracy for target ship. (H: High accuracy, L: Low accuracy.)
RAIM Target’s RAIM status. (USED: Using RAIM, UNUSED: Not using RAIM.).
TIME STAMP Time at which the target was last detected. Not displayed for AIS base stations.
POSN
QUALITY
Target’s position quality. Possible position qualities are shown in the list below:
Quality indication Meaning
No position Position data not available.
Manual position Position data is input manually.
Dead reckoning position Position calculated by dead
reckoning.
Outdated position > 200 m More than 200 m from last
estimated position.
Position > 10 m Difference of more than 10 m from last es-
timated position.
Position with RAIM > 10 m Difference of more than 10 m from last es-
timated position.
Position < 10 m Difference of less than 10 m from last esti-
mated position.
Position with RAIM < 10 m Difference of less than 10 m from last esti-
mated position.
Valid position with no time stamp No time stamp available.
HDG/SOG/
COG QUALI-
TY
Target’s gyro/speed sensor quality. Possible sensor qualities are shown in the list
below:
Quality indication Meaning
HIGH Target is equipped with sensors which
meet the requirements of the VTT Stan-
dard for Inland Navigation.
LOW Target is not equipped with sensors which
meet the requirements of the VTT Stan-
dard for Inland Navigation.
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