Ag Leader GPS 2500/2500B Operators Manual - Manual (Page 25)

19
GPS 2500/2500B S
MART
A
NTENNA
O
PERATING
THE
B
AS
E
S
TA
T
IO
N
A fixed location ensures the GPS 2500B uses the same reference coordinates every time and they do
not unintentionally change; otherwise, an unwanted jump in the rover’s offset position from one RTK
session to the next may occur (such as a tractor following an A-B line that is offset by several
centimeters up to several meters from one RTK session to the next).
Fixed mode is intended for an GPS 2500B that is permanently mounted in a fixed location (such as on a
radio tower or other permanent structure), where you are satisfied with its coverage and you will use it
for RTK coverage of the same area from day to day, season to season.
If you install the GPS 2500B within 50 m of the fixed coordinates, it will use these reference coordinates
for its RTK solution. The reference coordinates remain the same (are not affected by a power cycle or
excessive drift in GPS solution) until you manually change them. The GPS 2500B will never use an
alternate reference location. If the current solution drifts more than 50 m from these reference
coordinates the GPS 2500B stops broadcasting the RTK message.
As shown, you use the FixedLoc
menu setting to set your GPS
2500B as a fixed base station (set
to YES) or a portable base station
To navigate to the FixedLoc setting:
• From the Top menu, select Base Station > Reference > FixedLoc.
S
ETTING THE
GPS 2500B
AS A
F
IXED
B
ASE
S
TATION
When setting a fixed location for your base station you have the following options:
• Entering new reference information manually
• Using the unit’s current position
• Using an average of the unit’s current position (averaging occurs for 300 sec)
Setting to Fixed Coordinates
You can manually enter base station coordinates before or after installing the GPS 2500B. For example,
if you know the exact installation location and you first enter the coordinates, the person installing the
GPS 2500B can simply install it and power it up.
To fix the base station location to a manually-entered coordinates:
1. On the Top menu, select Base Station > Reference > FixedLoc.
2. Use the Up Arrow or Down Arrow button to change the value to Yes and then
press Enter.
NOTE
In areas of ionospheric activity re-averaging the unit’s position (third bullet above) may provide the
most reliable location information.
Fixed base station mode Portable base station mode