Furuno 821, 841 manual }

4
2.2 Display Indications and Markers
0.5
Range
Range ring interval
Echo trail, AUTO tuning
Echo trail elapsed time,
echo trail time, tuning indicator
Guard zone
Fast Time Constant
(rain clutter suppressor)
Echo stretch
Interference rejector
EBL
Range ring
Cursor
Heading marker
Guard zone
area
VRM
HDG 326.8°
SP
Pulsewidth
Heading (requires
heading data)
OFF
CENTER
1.5 NM
Off center
VRM EBL + CURSOR
0.675 NM 220.9° R 0.646 NM 308.7° R
TRAIL AUTO
15S
G (IN)
FTC1
ES
IR
0:00
VRM
range EBL
bearing Cursor
range Cursor bearing
}
Range and bearing to cursor
or cursor position in latitude
and longitude may be displayed
by pressing the [HM OFF] key.
CU
Presentation mode
Figure 2-2 Display indications
2.3 Turning 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 skipped—you
can transmit immediately.
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,
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.