Furuno FR-2105-B - Manual (Page 54)

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Displaying and erasing echo trails
Press the RADAR MENU and [1] key to activate or deactivate the echo trails feature.
[FUNCTIONS 1]
1 TARGET TRAILS
2 TARGET ALARM 1 or 2
3 ORIGIN MARK 1 to 10
4 INDEX LINES
5 ZOOM*
6 PULSE WIDTH
7 INT REJECT
8 ARPA
9 VIDEO PLOT
0 [FUNCTION 2]
*: R-type only
Each press of the [1] key within 5 seconds cyclically changes echo trail length (time) as
below:
OFF - 30 s - 1 min - 3 min - 5 min - 15 min - 30 min - continuous - OFF
The current echo trail setting is displayed at the lower-right corner of the screen.
Suppose that "3 MIN" has just been selected. If the [1] key is hit on the FUNCTION 1 menu
more than 5 seconds later, echo trails are removed from the display (memory still alive with
echo trail timer count going on). Next hitting of the key calls out the echo trails on the screen.
To proceed to longer plot intervals, successively push the [1] key with a hit-and-release action.
The larger the echo trail length, the larger the echo trail plot interval.
Note: Holding the [1] key depressed for about 3 seconds on the FUNCTION 1 menu will
cause a loss of echo trail data so far stored in an memory.
Resetting echo trails
To reset (or clear) the echo trail memory, hold the TARGET TRAILS CANCEL key
depressed for about 3 seconds. Echo trails are cleared and the trailing process restarts from
time count zero at current echo trail plot interval. When memory assigned to echo trailing
becomes the echo trail timer at the lower-right corner of the screen freezes and the oldest
trails are erased to show the latest trails.
R/N/W versions: The TARGET TRAILS CANCEL key can be functioned as follows;
(a) Pressing the key within 3 seconds after the first press selects the trail time: 30 seconds, 1
min., and then 3 min.
(b) Pressing the key after more than 3 seconds from the first press tums off/on the trail
display.
(c) Pressing the key for more than 2 seconds turns off the trail display with a beep. The trail
memory is cleared. The next press for more than 2 seconds turns on the trail display and
new trailing starts.