INTERFERENCE SOURCES or BAD RECEPTION Se 1 ect Funct ion
Land Sources:
1. Military
installations. (High power
transmitters in the loran
band.)
2. Hydro-electric plants. (Dams)
3. High voltage power
lines. These radiate noise at high levels.
4. Storms. A storm between you and the loran station
can interfere with
the
signals, even if it's many
miles away.
5. Mountains, trees, buildings. These reflect the
signals. Try
to stay
in
an open area.
Boat Sources:
1. Boat engine. Resistor spark plugs help, alternator noise filter may
also be required.
2. Power cable routed to fuse
panel instead of
directly
to
battery. Route
the
power
cable
directly
to the battery.
3. Bad antenna
placement. The antenna should be placed in an open
area on the
boat, away
from other antennas or structure.
4. Fluorescent lights.
Symptoms of noise or interference problems: turned off.
1. Loran won't lock on to stations
2. Accuracy
is not repeatable or erratic
a. Try using
the manual mode
3. XTE, Bearing, Heading, SOG, or TEG erratic or
inaccurate
4. Cross Track arrows move too much
a. Waypoint must be recalled to use cross track error feature.
5. Loses lock while boat is moving:
a. Try resistor spark plugs
Dst Log in ml
'fl .4. T • 1.
og in .m
Dst Log in NFl
I
I
I
I 'I
Now
press
the
key adjacent to the desired label. The Z-9500 will return
to the sonar screen.
The distance
log displays the distance travelled from the time it was
first turned on. To reset the distance log
to zero, press
the MENU
key.
Next, press the key adjacent to the "More" label. This brings up the
second menu page. Now press the
key adjacent
to the "Digital Dis-
play' label. Next, press the key adjacent to the MORE label again.
Finally, press
the key next to the Distance Log label. Press the key
adjacent to the "Reset Dst. Log" label to reset the distance
log display
to zero.
To turn the distance
log off, go
to the distance
log menu,
then
press
the
key adjacent
to the "Dst Log Disp
Off" menu.
NOTE: The distance log is retained in memory when the Z-9500 is
LORAN DISPLAY
Position information can be displayed on the Z-9500's sonar screen.
Latitude/longitude, or distance and
bearing
to a
waypoint
are
placed
on
the left side of the sonar screen.
To display position
information on the sonar screen, press
the MENU
key. Next, press
the
key adjacent to the "More" label. Now
press
the
key next to the
"Digital Display" label. Press the
key
next to the "More"
label until the screen shown at the
top
of the
next
page appears. Now
press
the
key adjacent
to the "Loran Position" label. The screen at the
top
of the next page appears. Press the
key adjacent
to the desired
function. For example, pressing the
key next to the "Show
Lat./Long."
102 35
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