Target Trails; True Or Relative Trails - Furuno FAR-2218-BB Operator's Manual

1. OPERATIONAL OVERVIEW
1.37

Target Trails

The trails of the radar echoes of targets can be displayed
in the form of synthetic afterglow. Target trails are shown
either relative or true and can be sea or ground stabi-
lized. True motion trails require a compass signal, and
position and speed data. When the range is changed,
trails are continued for targets which were already dis-
played in the previous range. Newly detected targets
have no trail when first detected.
1.37.1

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 present true target
movements in accordance with their over-the-ground
speeds and courses.
Note 1: The [TRAIL MODE] box is shown in yellow un-
der following conditions:
• [TRAIL MODE] is set to [TRUE] and presentation
mode is set to [HEAD UP RM].
• [TRAIL MODE] is set to [TRUE] and presentation
mode is set to [STERN UP].
The reference for the past position displays for AIS and TT is also switched whenever
trail reference is switched.
Note 2: The [TRAIL MODE] box is shown in yellow under the following conditions:
• [TRAIL MODE] is set to [TRUE] and presentation mode is set to [HEAD UP RM].
• [TRAIL MODE] is set to [TRUE] and presentation mode is set to [STERN UP RM].
1. Select the [TRAIL] box at the bottom-right of the screen, then right-click. The
[TRAIL MENU] appears.
[ TRAIL ] box
2. Select [TRAIL MODE].
1-58
Right-click the
[ TRAIL box ] to show
the [ TRAILS ] menu.
Trail time Trail mode indication
True target trails -
Stationary targets
are not smeared.
Relative target trails -
Targets move relative
to own ship, stationary
targets are smeared.