2. OPERATION
2-8
2.7 GPS
Setup
The GPS SETUP menu smoothes position and course, averages speed, applies
position offset, and deactivates unhealthy satellites.
2.7.1
Displaying the GPS setup menu
1. Press the
MENU
key to open the menu.
2. Choose GPS SETUP and then press the
ENT
key.
GPS SETUP
SMOOTH POS
:
0SEC
SMOOTH S/C
: 5SEC
LAT OFFSET
:
0.000'N
LON OFFSET
:
0.000'E
DISABLE SV
:
GPS SETUP menu
2.7.2
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 randomly, even if the
vessel at anchor. This change can be smoothed by averaging a number of GPS
fixes. The setting range is from 0 (no smoothing) to 999 seconds. The higher the
setting the more smoothing. However, too high a setting slows updating of
position.
SMOOTH S/C (Smoothing speed/course)
Ship’s speed and course are directly measured by receiving GPS satellite
signals, independent of positions. The data varies with receiving conditions and
other factors. You can reduce this random variation by increasing the smoothing.
The higher the setting the more that speed and course are smoothed. If the
setting is too high, however, the follow-up to actual values gets slower. The
setting range is from 0 (no smoothing) to 999 seconds.
LAT/LON OFFSET (L/L position offset)
If GPS fixes are erroneous while at anchor, enter a position offset to compensate
for position error. Consult a nautical chart to determine latitude and longitude
differences between the chart and GPS display. Enter that value as the offset.
