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8. CUSTOMIZING YOUR UNIT
8-7
8.3 ADVANCED Menu
The ADVANCED menu calibrates data.
FIX
Item Settings
FIX CORRECTION
GPS-generated position may be off by
some seconds because of various
factors. In this case, you can
automatically correct GPS position by
selecting On.
COMPUTE CORRECTION
Corrects the GPS antenna position.
After placing the cursor at the own
ship’s true position, select this item.
CORRECTION OFFSET
Corrects the GPS antenna position
manually. Enter the longitude and
latitude numeric data of own ship’s true
position.
POSITION FILTER
When the DOP or receiving condition is
unfavorable, the GPS fix may change,
even if the vessel is dead in water. This
change can be reduced by smoothing
the raw GPS fixes. You can choose the
setting from among Off, Low, Medium
and High. The higher the setting, the
more smoothed the raw data, however
too high a setting slows response time
to change in latitude and longitude.
This is especially noticeable at high
ship’s speeds. Off is normal setting;
increase the setting if the GPS fix
changes.
SPEED FILTER
During position fixing, ship’s velocity
(speed) is directly measured by
receiving GPS satellite signals. The
raw velocity data may change
randomly depending on receiving
conditions and other factors. You can
reduce this random variation by
increasing the filter setting. Like with
latitude and longitude filter, the higher
the speed filter the more smoothed the
raw data. If the setting is too high,
however, the response to speed and
course change slows. For no
smoothing, choose Off. (Off, Low,
Medium, High)