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SPSx51 Modular GPS Receivers User Guide     
103
Automatically Setting up a Mobile Base Station Using AutoBase Technology     
8
station. Make sure that you use the same base station latitude, longitude, and height as in 
the previous setup otherwise you will experience position or height errors in all subsequent 
measurements.
Trimble recommends that after any new base station setup, or at the start of each 
measurement session, you measure a known point to verify that position and height errors 
are within tolerance. This is good practice and it takes just a few seconds to eliminate 
potentially gross errors typically associated with repeated daily base station setups.
The AutoBase process
 
Figure 8.1
Autobase process flowchart
On
Display 
AutoBase 
Warning
No
Is 
AutoBase 
Warning 
On or Off?
Create new 
application 
file
Save new 
application 
file with 
“Auto” base 
name
Make new 
“Auto” 
application 
file active
Power On
Receiver
Receiver 
looks for 
application 
files
Do 
application 
files exist?
Off
No
Yes
Any 
application 
file that 
corresponds 
with the 
current 
position?
No
Yes
Yes
Make most 
recently 
created 
application 
active
Make 
corresponding 
application
file active
Is there more 
than one 
acceptable 
application 
file?
Auto Base
turned on
Auto Base
turned off
Status last 
application 
file used 
before 
power off.