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5.9 GPS SETUP menu
This menu sets up GPS-related items.
Keying sequence: [MENU ESC] [0] [7]
GPS SETUP
GPS SMOOTHING
Posn 000 (000 ~ 999)
Spd 000 (000 ~ 999)
GEODETIC WGS-84 OTHER(002)
POS CALIB 00.000'N 00.000'E
UNHEALTH RSTR DISABLED (03)
TIME DIFF +00:00
▼▲ :Cursor :N/S,E/W,+/-
ENT:Enter ESC:Esc
Figure 5-11 GPS SETUP menu
GPS SETUP menu description
GPS POSITION SMOOTHING: When the DOP 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 smooth-
ing the raw GPS fixes. A setting between 0 and 9 is available. The
higher the setting the more smoothed the raw data. Note however
that too high a setting slows response time to change in latitude
and longitude. This is especially noticeable at high ship’s speeds.
"000" is the default setting; increase the setting if the GPS fix
changes greatly.
LATITUDE
RAW POSITION FIX
AFTER SMOOTHING
LONGITUDE
Figure 5-12 GPS position smoothing
GPS SPEED SMOOTHING: During position fixing, ship’s ve-
locity (speed and course) is directly measured by receiving GPS
satellite signals. The raw velocity data may change randomly de-
pending on receiving conditions and other factors. You can reduce
this random variation by increasing the smoothing. Like with lati-
tude 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.
"000" is the default setting; increase the setting if the GPS speed
changes greatly.