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2. RADAR, CHART RADAR OPERATION
2-25
How to assess risk of collision from the context-sensitive menu
1. Right-click the display area to show the context-sensitive menu.
2. Select [EBL Offset] and then [EBL 1] or [EBL 2].
3. Put the cursor on a target that appears as a threat (A in the figure below).
4. Push the left button to shift the EBL origin to the cursor location.
5. Spin the scrollwheel or use the trackball to bisect the target at the new position
(A'). The EBL indication shows the target ship's course, which may be true or rel-
ative depending on the EBL bearing reference setting.
6. It is also possible to read CPA by using a VRM as shown in left-hand figure below.
If the EBL passes through the sweep origin (own ship) as illustrated in the right-
hand figure below, the target ship is on a collision course.
To return the EBL origin to the center of the screen, put the cursor on the EBL origin
then right-click.
2.19.2 Point of reference for origin point of offset EBL
The origin point of the offset EBL can be ground stabilized (geographically fixed), north
stabilized (true) or referenced to your ship's heading (relative).
1. Open the menu then select the [3 NAV TOOL] and [2 EBL•VRM] (B type) or [2
EBL•VRM•CURSOR] (IMO and A types) menus to display the [2 EBL•VRM] (B
type) or [2 EBL•VRM•CURSOR] (IMO and A types) menu.
2. Select [5 EBL OFFSET BASE POINT] (B type) or [1 EBL OFFSET BASE POINT]
(IMO and A types).
3. Select [STAB GND], [STAB HDG], or [STAB NORTH] as appropriate.
STAB GND: Reference to latitude and longitude. Origin position is always fixed
regardless of your ship's movement.
STAB HDG: Reference to heading. The relationship of relative bearing between
origin position and own position is kept always.
STAB NORTH: Reference to North. The relationship of true bearing between or-
igin position and own position is kept always.
4. Close the menu.
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A
A’
A
A’
VRM1
EBL1
EBL1
(a)
(b)
T
EBL 1
138.2
°
VRM 1
TTG 10:00
0.850
NM
T
EBL 1
150.3
°
VRM 1
TTG 10:00
0.850
NM