Furuno 841 MARK-2 manual Guard Alarm, WPT-UP waypoint-up, Selecting guard zone type

WPT-UP (waypoint-up)

An azimuth stabilized display in which the line connecting the center with the top of the display indicates the bearing to the “TO” waypoint, which is selected on the naviga- tional equipment connected to the radar. When navigating a route and own ship en- ters the arrival zone of a waypoint, the ra- dar displays the bearing to the next “TO” waypoint.

Procedure

1.Press the [MENU] key to open the menu.

2.Press the cursor pad to select 2. P/L, IR, NR & Radar Mode.

3.Press the cursor pad to select Radar mode.

4.Select option for CU or WPT-UP.

5.Press the [ENT] key followed by the [MENU] key.

NOTE:

Insert display example and description for each presentation mode, like in FR-1500M2 or FR- 8000 series’. Also, add section on how display is reset in true motion and change Table of Contents if necessary.

2.16 Guard Alarm

The guard alarm allows the operator to set the desired range and bearing for a guard zone. When ships, islands, landmasses, etc. enter (or exit, depending on type of guard zone in use.) the guard zone an audible alarm sounds to call the operator’s attention. The alarm is very effective as an anticollision aid when using an autopilot or navigating in narrow channels.

CAUTION

The guard alarm is a useful anti-collision aid, but

Selecting guard zone type

does not relieve the operator of the responsibility to also keep a visual lookout for possible collision situations. The alarm should never be used as the sole means for detecting possible collision situations.

The guard alarm can be set to sound on tar- gets entering (guard in) or exiting (guard out) the guard zone. Select type of guard zone as follows.

1)Press the [MENU] key to display the menu.

2)Select Mode & Function and press the [ENT] key.

3)Select Alarm Mode to IN or OUT.

4)Press the [ENT] key followed by the [MENU] key.

Dashed line: no alarm

Guard zone

IN ALARM OUT ALARM

Figure 2-13 In and out alarms

Setting the guard zone

1)Mentally create the guard zone you want to display. See Figure 2-14 (1).

2)Operate the cursor pad to set cursor on top (bottom) left edge of the guard zone. Press the [GUARD] key. *G (IN) (or G OUT)), with asterisk blinking, appears at the top right-hand corner on the display. (The asterisk indicates the guard zone is partially set.) See Figure 2-14 (2).

3)Operate the cursor pad to set cursor on bottom (top) right edge of the guard zone and press the [GUARD] key. The aster- isk disappears. See Figure 2-14 (3).

4)Guard zone appears on the display. See Figure 2-14 (4).

Silencing the audible alarm

Any ships, landmasses, etc. coming into (or going out of) the guard zone will trigger the audible alarm and display the guard zone in reverse video. You can silence the alarm by

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