Furuno FR-10, Руководство оператора

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5. AIS OPERATION
5-6
5.9 Vector Attributes
5.9.1 What is a vector?
A vector is a line extending from a tracked target. A vector shows speed and course
of the target. The top of a vector shows estimated position of the target after the se-
lected vector time elapses. If you extend the vector length (time), you can evaluate the
risk of collision with any target.
5.9.2 Vector time and vector reference
1. Press the MENU key to open the menu.
2. Select [Target], then press the ENTER key.
3. Select [Vector Time], then press the ENTER key.
4. Select time, then press the ENTER key.
5. Select [Vector Reference], then press the ENTER key.
6. Select [Relative] or [True] then press the ENTER key.
[ Relative ]: Other ships’ vectors are displayed relative to your ship. This mode
helps find targets on a collision course. If a ship is on a collision course with your
ship, the vector of a ship points toward your ship position.
[
True ]: Your ship’s and other ships’ vectors are displayed at their true motions.
This mode helps discriminate between moving and stationary targets.
7. Press the MENU key to close the menu.
5.10 Past Position Display (target past position)
This radar can display time-spaced dots (maximum ten dots) that marks the past po-
sitions of any tracked AIS target. You can evaluate actions of a target by the spacing
between dots. Below are examples of dot spacing and target movement.
You can select the number of history dots to display and the time interval to display
the history dots.
1. Press the MENU key to open the menu.
2. Select [Target], then press the ENTER key.
3. Select [Past Positions], then press the ENTER key.
4. Select number of past position dots to display (5 or 10) or select [Off] to turn off
the past position display.
5. Press the ENTER key.
6. Select [Past Posn Interval], then press the ENTER key.
(a) Ship turning (b) Ship running
straight (c) Ship reduced
speed (d) Ship increased
speed