Furuno GP-3500F-D Operator's Manual page 136

9. CUSTOMIZING YOUR UNIT
LATITUDE OFFSET, LONGITUDE OFFSET
GPS-generated position may be off by some seconds because of various factors.
In this case, you can apply an offset to GPS position to refine position accuracy.
Calculate the error on a nautical chart.
1. Rotate the [ENTER] knob to select LATITUDE OFFSET or LONGITUDE
OFFSET.
2. Press the numeric keys to enter the error value.
3. To switch North and South (East and West), press the [CURSOR ON/OFF]
key.
4. Press the [ENTER] knob.
The L/L offset icon (
display.
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.
DEFAULT LATITUDE, DEFAULT LONGITUDE
The default latitude and longitude position is Seattle, U.S.A. (45°35.000'N,
125°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. Use the [CURSOR ON/OFF] key to switch co-ordinate.
ANTENNA HEIGHT
Enter the height of the antenna unit above sea surface. For further details, refer
to the installation manual.
GPS FIX MODE
You can choose the position-fixing mode from 2D or 2D/3D. When selecting
2D/3D, 2D or 3D is automatically chosen depending on the number of available
satellites. (3D requires four or more satellites.)
DGPS/WAAS
Choose the position-fixing method among DGPS, WAAS and AUTO. The
GP-3500F requires the optional DGPS beacon receiver to fix position by DGPS.
For WAAS, see the "WAAS Facility" at the back of this manual.
AUTO fixes position by WAAS when DGPS correction data is not available.
For normal GPS positioning, select "OFF."
9-20
L
) appears at the bottom of the PLOTTER (or PILOT)
L