2.2 Display Indications and Markers
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| Heading (requires |
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Range |
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| heading data) | Echo trail, AUTO tuning | ||
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| TRAIL AUTO | ||
Range ring interval |
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| Echo trail elapsed time, | |
0.5 |
| HDG 326.8° |
| 0:00 15S | ||
Presentation mode | 1.5NM |
| G (IN) | echo trail time, tuning indicator | ||
CU |
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Off center |
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| FTC1 | Guard zone | |
OFF |
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| ES | ||
Pulsewidth | CENTER |
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| IR | Fast Time Constant |
SP |
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| (rain clutter suppressor) |
Heading marker |
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| Echo stretch |
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| Interference rejector | |
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Guard zone |
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area |
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| Range ring |
Cursor |
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EBL |
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| VRM |
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| VRM | EBL | + CURSOR | Range and bearing to cursor | |
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| or cursor position in latitude | ||||
| 0.675NM 220.9°R 0.646NM 308.7°R | } and longitude may be displayed | ||||
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| by pressing the [HM OFF] key. |
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| VRM | EBL | Cursor | Cursor | |
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| range | bearing | range | bearing | |
Figure 2-2 Display indications
2.3Turning the Radar On and
Off
Turning the radar on
Press the [POWER] key to turn the radar on or off. The control panel lights and a timer displays the time remaining for warm up of the magnetron (the device which produces radar pulses), counting down from 2:30 (MODEL 841) or 1:30 (MODEL 821) to 0:01.
Note: When the power is reapplied within a certain amount of time and circuits remain charged, the warmup process is
CAUTION
The radar antenna emits high frequency radio radiation which can be harmful, particularly to your eyes. Never look directly at the antenna from a distance of less than two feet when the radar is in operation. Always make sure no one is near the antenna before turning on the radar.
Note: When the heading signal is lost, the HDG readout at the top of the screen shows ***.*. This warning stays on when the heading sig- nal is restored to warn the operator that the readout may be unrealiable. The warning may be erased by pressing the [DISP MODE] key,
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