How To Select The Number Of Past Position Points To Be Displayed; Past Position Display Orientation; Stabilization In True Motion; Lost Target - Furuno FAR-2218-BB Operator's Manual

4.11.2 How to select the number of past position points to be dis-
played
1. Open the menu.
2. Select [5 TT•AIS].
3. Select [4 TT•AIS SYMBOL].
4. Select [5 TT•AIS PAST POSN POINTS].
5. Select [5] or [10] as appropriate, then press the ADJUST knob.
6. Close the menu.
4.11.3

Past position display orientation

Past position orientation, true or relative, is controlled with [TRAIL MODE] in the
[TRAIL] context menu. To adjust the trail orientation, see section 1.37.1.
4.11.4

Stabilization in true motion

True motion past position display can be ground stabilized or sea stabilized. The
[TRAIL] box shows current stabilization as "TRUE-G" or "TRUE-S". To change stabi-
lization mode, open the [SHIP SPEED MENU] menu and set [SHIP SPEED] to
[LOG(BT)] (ground stabilization) or [LOG(WT)] (sea stabilization).
4.12

Lost Target

A target is declared a lost target when it fails to produce data for six minutes or five
reporting intervals, whichever is the shorter. When this occurs, the target is marked
with the (flashing) lost target symbol and the message "AIS TARGET LOST" appears
in the Alert Box. To acknowledge a lost target, press the ALARM ACK key, or use the
trackball to select the [ALERT] box then press the left button.
4.12.1

How to set the lost target filter

If there are a lot of AIS targets in your area, the lost target alert can sound frequently.
In this case you may wish to have the alert ignore lost targets whose range, speed,
class or length are below the threshold value you specify.
1. Open the menu.
2. Select [5 TT•AIS].
3. Select [5 AIS].
4. Select [0 NEXT].
5. Select [3 AIS LOST TGT FILTER].
6. Select [MAX RANGE].
7. Referring to the following table, select the appropriate
filter, then press the ENTER MARK key.
Filter type
[MAX RANGE] Any AIS targets beyond the range set here will not trigger the
lost target alert.
4. AIS OPERATION
Definition
4-15