How To Set The Ais Lost Target Filter; How To Display Ais Target Past Positions; How To Enable/Disable The Past Position Display, Select Past Position Reference - Furuno FCR-2119-BB Operation Manual

4.11.2

How to set the AIS lost target filter

If you are in an area where AIS targets often become lost, the lost target alarm may
activate frequently. In this case, you may want to specify which targets to classify as
lost targets, to prevent frequent triggering of the lost target alarm.
1. Right-click the AIS mode indication then click [AIS menu]
to show that menu.
2. Open the [6 LOST FILTER] menu.
3. Set items 1-3, referring to the description below.
[1 MAX RANGE]: Set the maximum range to use. Any
AIS target at a distance greater than set here will not trig-
ger the lost target alarm.
[2 MIN SHIP SPEED]: Set the minimum speed to use.
Any AIS target whose speed is slower than set here will
not trigger the lost target alarm.
[3 EXCEPT CLASS B]: Select ON to exclude class B AIS targets from the lost tar-
get alarm.
4. Close the menu.
4.12

How to Display AIS Target Past Positions

The past position display shows equally time-spaced dots marking past positions of
activated AIS targets. If a target changes its speed, the spacing will be uneven. If it
changes course, its plotted course will not be a straight line.
Below are sample past position displays.
(a) Ship turning
4.12.1 How to enable/disable the
past position display, select
past position reference
Click the indications circled in the figure
below to set the plot interval (or disable
the display) and the past position refer-
ence (true or relative).
(b) Ship running
(c) Ship reduced
straight
speed
4. AIS OPERATION
(d) Ship increased
speed
Plot interval, past
position display
ON/OFF
Past position
reference
4-13