True Or Relative Target Trails; Trail Time; How To Reset Target Trails - Furuno FCR-21x9-BB Operator's Manual

2. RADAR, CHART RADAR OPERATION
2.19.2

True or relative target trails

You may display echo trails in true or relative motion. Relative trails show relative
movements between targets and own ship. True motion trails present true target
movements in accordance with their over-the-ground speeds and courses. The trail
and past position modes in the North-up true motion are fixed to True.
Click the Trail mode indication to select [True-G] or [REL] as appropriate.
True target trails
(No smearing of
stationary targets)
2.19.3

Trail time

Trail time, the trail plotting interval, can be selected with the scrollwheel, left button or
right button.
The trail timer 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.
How to select a trail time
Four controls are available to select a trail time. The times available depend on the
control used as shown in the table below.
• Left button, right button or scrollwheel: Put the cursor on the Trail time indication
at the bottom-right position then operate the control. For the right button, a context-
sensitive menu appears. Click the desired time.
• Control Unit: Push the TRAIL key.
Control
Left button, right button,
TRAIL key
Scrollwheel
2.19.4

How to reset target trails

All trails may be erased (including those in the memory) and restarted to start trails
fresh.
Control Unit: Press and hold down the TRAIL key until trails disappear.
Context-sensitive menu: Right-click the display area to show the context-sensitive
menu then select [Delete All Trails].
2-22
Relative target trails
(Targets moving
relative to own ship)
OFF, 15 sec, 30 sec, 1 min, 3 min, 6 min, 15 min, 30 min,
CONT(inuous)
OFF, 15 sec, 30 sec, 1-30 min (30 sec intervals), CONT(inuous)
Available setting