Target Trails (Echo Trails); Trail (Echo Trail) - Furuno FR-2105 Operator's Manual

1.26 Target Trails (Echo Trails)

It is possible to display the trails by the radar echoes of targets in the form of synthetic
afterglow. The afterglow can be selected in a single tone or gradual shading as set on RADAR
1 menu.
Trail gradation
Echo trails may be shown in monotone or gradual shading. Gradual shading paints the trails
getting thinner with time just like the afterglow on an analog PPI radar.
(Monotone (SGL))
- Press the [7] key to select menu item 7 TRAIL GRAD (graduation) in step 4, and
- Press the [7] key to select (or highlight) SGL (single tone) or MULT (multiple shading)
option in step 5.
True or relative trails
You may display echo trails in true or relative motion (only true trail on TM). Relative trails
show relative movements between targets and own ship. True motion trails require a
gyrocompass signal and own ship speed input to cancel out own ship's movement and present
true target movements in accordance with their over-the-ground speeds and courses.
(a) True target trails - no smearing
of stationary targets
Note: When true trail is selected on the RM mode, the legend TRUE TRAIL appears in red.
No true-relative selection on TM, it is only True trails on TM mode.
To select true or relative echo trail presentation:
1. Press the RADAR MENU key to show the FUNCTIONS 1 menu.
2. Press the [0] key twice for FUNCTION 3 menu, then [2] key to show the RADAR 1 menu.
3. Press the [6] key to select menu item 6 TRAIL.
4. Press the [6] key to select (or highlight) REL (Relative) or TRUE option.
5. Press the ENTER key to confirm your selection; then RADAR MENU key to close the
menu.
(b) Relative target trails - all
targets moving relative to own
ship
-1.35-
(Gradual shading (MULT))