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7. OTHER FUNCTIONS
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7.10 GPS Setup
The GPS SETUP menu smoothes position
and course, averages speed, applies position
offset, and deactivates unhealthy satellites.
1. Press the [MENU] key once or twice to
open the menu.
2. Choose GPS SETUP and then press the
[ENT] key.
GPS SETUP
SMOOTH POS : 0SEC
SMOOTH S/C : 5SEC
AVR. SPEED : 60SEC
LAT OFFSET : 0.000'N
LON OFFSET : 0.000'E
DISABLE SV : _ _ _ _ _ _
FIX MODE : 2/3D
GPS SETUP menu
3. Choose item and then press the [ENT]
key.
4. Change setting with the cursor pad and
then press the [ENT] key.
5. Press the [MENU] key twice to finish.
GPS SETUP menu description
SMOOTH POS (Smoothing position)
When the DOP (Dilution of Precision, the
index for position-fixing accuracy) or receiving
condition is unfavorable, the GPS fix may
change greatly, even if the vessel is dead in
water. This change can be reduced by
smoothing the raw GPS fixes. The setting
range is from 0 (no smoothing) to 999
seconds. 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. “0” is the
normal setting; increase the setting if the
GPS fix changes greatly.
SMOOTH S/C (Smoothing speed/course)
During position fixing, ship’s velocity (speed
and course) is directly measured by receiving
GPS satellite signals. The raw velocity data
may changes randomly depending on
receiving conditions and other factors. You
can reduce this random variation by
increasing the smoothing. Like with latitude
and longitude smoothing, the higher the
speed and course smoothing the more
smoothed the raw data. If the setting is too
high, however, the response to speed and
course change slows. The setting range is
from 0 (no smoothing) to 9999 seconds.
AVR. SPEED (Speed averaging)
Calculation of ETA and TTG, etc. is based on
average ship's speed over a given period. If
the period is too long or too short, calculation
error will result. Change this setting if
calculation error occurs. The default setting is
60 seconds. The setting range is from 0 (no
averaging) to 9999 seconds.
LAT/LON OFFSET (L/L position offset)
You may apply an offset to latitude and
longitude position generated by the GPS
receiver, to increase position accuracy.
DISABLE SV
Every GPS satellite is broadcasting abnormal
satellite number(s) in its Almanac, which
contains general orbital data about all GPS
satellites. Using this information, the GPS
receiver automatically eliminates any
malfunctioning satellite from the GPS satellite
schedule. However, the Almanac sometimes
may not contain this information. You can
disable an inoperative satellite manually.
Enter satellite number in two digits and then
press the [ENT] key. To restore a satellite
enter “00”.