Notes on the guard alarm
ÁThe alarm is a useful
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
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 | Tx |
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
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.