Better Distinction Of Echoes; Setting/Oeleting The Alarm - Furuno 1830 Operator's Manual

This type of interfer^ce is reduced by activating the Interference Rejector
Circuit. Press the touchpad to activate the Circuit, and you will see
the indicator "IH" appears at the upper right-hånd side of the screen.
Press the touchpad again to switch off the Circuit when no interference
exists, otherwise weaker targets may be missed. Note that the IR circuit is
defaultcd to on when turning on the power.
(A) radar interference,
IR
Circuit
"OFF"
(B) IR Circuit "ON",
interference reduced
Fig,30 Radar Interference
BETTER DISTINCTION OF BCHOES
Eon
niEm
V..
As a general rule of thumb, the reftected echoes from long distance targets
are displayed on the screen as weaker and smaller blips even though they
are compensated by the radar's internal circuitry.
The touchpad is provlded to magnify small bHps in middle and long
ranges, i.e., 1.5 to 24 mile ranges, Now press the touchpad. The
indicator
"ES"
appears at the upper right-hand side of toe screen,
and the
echoes are doubled lengthwise. Note that this function is inactive on the
0.25, 0.5 and 0.75 mile ranges; the
ES
indicator is shown in inverse video
to call your attention.
Press the touchpad again to turn off this function.
SETTING/DBLETING THE ALARM
nuArø
UlarH
The alarm
function
allows the operator to set the desired range
(0 to
maximum range) and bearing (0 to 360°) for a guard zone. Should ships.
Islands, landmasses,
etc. come
in
to the
guard zone
an
alarm will
be
generated. The alarm is very effective as an anti-colBsion aid when using
an autopilot or navigating in narrow channels.
Although the alarm is useful as an anti-colKsion aid, it does not relieve the
operator of the responsibility to watch out for possible coltsion situations.
The alarm should not be used as a primary means to detect possible collision
situations .
Now the procedure to set the alarms.
3a