Vectors True Or Relative; Displaying Target Data - Furuno FR-1500 Operator's Manual

2.7 Vectors True or Relative

Target vectors are displayed in relative or true mode. Own ship does not have a vector in relative
mode. You may select true or relative vector with VECT REF on the PLOT MENU 1.
2.7.1 Vector time
From the PLOT MENU 1, VECT TIME (or the length of vectors) can be set to 30 seconds, 1, 3, 6,
15 or 30 minutes and the selected vector time is indicated on the screen.
The vector tip shows an estimated position of the target after the selected vector time elapses. It
can be valuable to extend the vector length to evaluate the risk of collision with any target.
2.7.2 Vector start time
Whenever the range is changed the vectors for tracked targets is reestablished. You can select
when to start re-establishment of the vectors with VECT START on the PLOT MENU 2. The
operator has the choices of 1 min or 20 scans.

2.8 Displaying Target Data

The ATA calculates motion trends (range, bearing, course, speed, CPA and TCPA) of all targets
under tracking, and displays data of selected target at the top right corner of the screen.
Note: At a speed under 5 kt the target data is displayed with a delay due to filtration
processing.
Displaying data
Place the cursor on a wanted target and press the [ENTER/SELECT] key. Data on the selected
target is displayed on the screen. The data includes the follows;
BRG/RNG (Bearing/Range): RNG/BRG (Range/Bearing): Range and bearing from own ship to the
selected target with suffix T (True).
CSE/SPD (Course/Speed): Course and speed are displayed for the selected target with suffix T
(True).
CPA (Closest Point of Approach) is the closest range a target will approach to own ship. Do not
confuse it with the operator preset CPA alarm limit.
TCPA is the time to CPA measured with present speeds of own ship and the targets. Both CPA
and TCPA are automatically calculated. When a target ship has passed clear of own ship, the CPA
is displayed and the TCPA appears as "**.*" TCPA is counted up to 99.59 min. and beyond this it is
indicated as TCPA>99.9 min.
Note 1: MARK DISP on the PLOT menu must be turned on to display target data.
Note 2: Target data may be displayed with reference to North (True) or own ship heading
(Relative). The desired reference may be selected with TARGET DATA on the PLOT menu.
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