Furuno FR-7252, FR-7112 Watchman, How watchman works, Turning on watchman, Cancelling watchman

Notes on the guard alarm

ÁThe alarm is a useful anti-collision aid, but does not relieve the operator of the respon- sibility to also keep a visual lookout for pos- sible collision situations.

ÁWhen the radar range is less than one half of the guard zone range, the guard zone disap- pears and “G (IN)” or “G (OUT)” appears in inverse video. If this happens, raise range to re-display the guard zone.

ÁA target echo does not always mean a land- mass, reef, ships or surface objects but can imply returns from sea surface or precipita- tion. As the level of these returns varies with environment, the operator should properly adjust the A/C SEA, A/C RAIN and GAIN to be sure the alarm system does not over- look target echoes.

3.8 Watchman

The watchman function periodically transmits the radar for one minute to check for targets in a guard zone. If it finds change in the zone from the previous transmission the audible alarm sounds and the radar transmits continuously. This feature is useful when you do not need the radar’s function continuously but want to be alerted to radar targets in a specific area.

Tx St-by Tx St-by

1 min 5, 10 or 1 min	5, 10 or
20 min	20 min

Watchman starts.

Figure 3-10 How watchman works

How watchman works

When the time selected for the watchman rest period has elapsed, the radar automatically transmits for one minute to check the condition inside the guard zone. If there is no change, the radar goes into stand-by (“WATCHMAN” ap- pears during stand-by.) If there is change, the radar sounds the audible alarm, cancels the watchman function and transmits continuously.

Turning on watchman

1.Create a guard zone (usually 360 degrees) with the guard alarm function.

2.Press the [MENU] key.

3.Select “OTHER MENU”.

4.Press the [ACQ/ENTER] key.

5.Select “13. Watchman”.

6.Operate the trackball to select watchman rest period; 5 minutes, 10 minutes or 20 minutes.

7.Press the [ACQ/ENTER] key.

8.Press the [MENU] key to close the menu.

“WATCHMAN” appears at the top of the screen, the radar transmits for one minute to check for targets inside the guard zone, and then the CRT shuts off and the radar goes into stand- by.

Cancelling watchman

Go into the “OTHER MENU” , and set “13. Watchman” for off.

Note 1:Watchman can be used without a guard zone.

Note 2:The alarm sounds just before the radar starts and stops transmitting.

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