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10. CUSTOMIZING YOUR UNIT
10-6
GPS SPEED AVE
Calculation of ETA 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, which is suitable for most
conditions.
LAT OFFSET, LON OFFSET
GPS-generated position may be off from the
chart. In this case, you can apply an offset to
GPS position to refine position accuracy.
Mark the equipment indication on the chart,
and then calculate the L/L error.
1. Select LAT OFFSET or LON OFFSET.
2. Press the EDIT soft key.
3. Key in the error value. To switch the
north and south (east and west), press
the N<->S (W<->E) soft key.
4. Press the ENTER soft key or [ENTER]
key.
DISABLE SATELLITE
Every GPS satellite is broadcasting
abnormal satellite number(s) in its Almanac,
which contains general orbital data about all
GPS satellites, including those which are
malfunctioning. 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.
If you hear about a malfunctioning satellite
from another source, you can disable it
manually. Enter satellite number (max. 3
satellites) in two digits and press the ENTER
soft key or the [ENTER] key.
LATITUDE, LONGITUDE
The default latitude and longitude position is
San Francisco, USA (38.00.000’N,
123.00.000’W). When the unit is turned on
for the first time it begins searching for its
actual position. To lessen the time required
to find position, you may enter your position
manually. To switch from North to South and
vice versa, use the N<-->S soft key, and to
switch from West to East and vice versa, use
the W<-->E soft key. Finally, press the
ENTER soft key or the [ENTER] key.
ANT. HEIGHT
Enter the height of the antenna unit above
sea surface. For further details refer to the
Installation Manual.
FIX MODE
You can choose the position-fixing mode
from 2D or 2D/3D. 2D requires three
satellites to fix position; 2D/3D requires three
or four satellites, whichever is available.
DGPS/WAAS SETUP OPTIONS menu
This menu sets parameters for the DGPS
beacon receiver. (GP1850WD, or GP1850W
equipped with DGPS beacon receiver.) and
WAAS. To display it, press the [MENU] key
followed by the GPS/DPGS/TD OPTIONS
and DGPS SETUP OPTIONS soft keys.
DGPS
WAAS
DGPS 3D
RETURN
DGPS/WAAS MODE AUTO
BEACON FREQUENCY AUTO
BEACON BAUD RATE AUTO
WAAS SEARCH AUTO
CORRECTIONA DATA SET 02
DGPS/WAAS ALARM ON
EDIT
DGPS/WAAS menu
DGPS/WAAS MODE
Select DGPS, WAAS or AUTO. (Position is
fixed by WAAS when DGPS correction data
is not available.)
BEACON FREQUENCY (for DGPS)
DGPS reference station can be searched
automatically or manually. For manual