3.6 Echo Trail
You can show the movement of all radar tar- gets relative to your vessel in afterglow. This function is useful for alerting you to possible collision situations.
Starting echo trail
Press the [ECHO TRAIL] key.
TRAIL, the echo trail time selected (on “OTHER MENU”) and elapsed time appear at the top
Figure 3-7 How the echo trail feature works
Note: Trails are restarted when range or mode is changed or zoom or shift is turned on.
Fixed time trail
1.When the elapsed time clock counts up to the trail time selected, the elapsed time dis- play freezes.
2.The oldest portions of trails are erased so only the latest trail, equal in length to the trail time selected, is shown.
3.Trail continues.
For example, the one minute trail time is se- lected. When the elapsed time clock counts up to 60 seconds, the elapsed time display freezes at “60,” but the latest one minute of trail is erased and then trail continues.
Continuous trail
The maximum continuous trail time is 99 min- utes and 59 seconds. When the elapsed time clock counts up to that time the elapsed time display is reset to zero and trail begins again.
Cancelling echo trail
Press the [ECHO TRAIL] key again.
Changing trail attributes
Trail gradation and trail time can be selected on the OTHER MENU.
Table 3-1 Trailing attributes
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| Description | ||||||
menu |
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| Trails can be shown in | |||||||
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| gradations. Multiple paints | |||||||
| trails getting thinner with | |||||||
| time just like the afterglow | |||||||
Trail Tone | on an analog PPI radar. | |||||||
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| Single | Multiple | |||||
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| Trails can be set for 15 | |
Trail Time | sec., 30sec., 1min., 3min., | |
6min., 15min., 30min., or | ||
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| continuous. |
3.7 Guard Alarm
The guard alarm allows the operator to set the desired range and bearing for a guard zone. When ships, islands, landmasses, etc. violate the guard zone an audible alarm sounds and the offending target blinks to call the operator’s at- tention.
Selection of guard zone type
The guard alarm can be set to sound when a target enters or exits the guard zone. You can select which type of guard alarm you want through the menu.
In alarm
The alarm sounds on targets entering the guard zone. “G (IN)” appears at the top
Out alarm
The alarm sounds on targets exiting the guard zone. “G (OUT)” appears at the top