Furuno FCR-2107 series, Operator'S Manual

Page: 67 / 556

2. Radar Operation
2-25
(a) True target trails (no
smearing of stationary
targets)
(b) Relative target trails
Target moving relative
to own ship
2.19 Target Trails
The trails of the radar echoes of targets may be displayed in the form of synthetic afterglow. Target trails are
selected either relative or true and may be sea or ground stabilized. True motion trails require a compass signal and
speed input.
2.19.1 True or relative trails
You can display echo trails in true or relative motion.
Relative trails show relative movements between targets
and own ship. True motion trails require a gyrocompass
signal, speed data and position data.
The reference for the past position displays for AIS and
TT is also switched whenever trail reference is switched.
1. Use the trackball to place the arrow on the TRAIL
MODE box at the bottom right corner of the screen.
2. Spin the scrollwheel to select TRUE or REL as
appropriate then push the scrollwheel.
2.19.2 Trail time
Trail time, the trail plotting interval, may be selected as follows:
1. Use the trackball to place the arrow on the TRAIL MODE box at bottom-right corner on the screen.
2. Push the left button or the scrollwheel to choose trail time as below. The longer the trail interval the longer the
length of the target trail.
Control Available setting
Left button, TRAILS key Off, 15 sec, 30 sec, 1 min, 3 min, 6 min, 15 min, 30 min, CONT(inuous)
Wheel OFF, 15 sec, 30 sec, 1-30 min (30 sec intervals), CONT(inuous)
The timer above the TRAIL MODE box counts up the trail time and is erased once the terminal count is reached.
For example, if the trail time is six minutes, the timer is erased when trails have been plotted six minutes. The
maximum time for continuous plotting is 99:59. When the timer counts to 99:59, the timer is reset to zero, all target
trails are erased then trails are restarted.
2.19.3 Resetting target trails
You can clear all target trails to restart the trail process. Target trails are cleared and the trailing process restarts
from time count zero at the current target trail plot interval.
1. Use the trackball to place the arrow on the TRAIL MODE box at the bottom right corner of the screen. The
guidance area reads "Trail SEL/L=Delete / OK /.
2. Long-push the left button or the TRAILS key to reset target trails.
2.19.4 Temporarily removing trails
Trails can be temporarily removed as follows:
1. Use the trackball to select the TRAIL MODE box at the bottom right corner of the screen.
2. Push the left button to display OFF.