Select About, you will see the Info. of A20 such as PN, SN, edition
of software and hardware.
At the main interface, if you choose Set, you will see the setting
options for A20 such as GPS, Link, Memory and System.
Choose GPS, you will see four options for your setting such as Mask,
Base, Rover, Static.
Select Mask, here you can set the mask of A20.
A20 User Manual
Operating
Menu (3)
Info/About
Set menu
Set/GPS (same function as hot button )
Set/GPS/Mask
28
