Acer F900 User Manual page 26

After setting your Pocket PC to the following connection mode and
activating the automatic update and Internet connection functions, the system
will automatically download the latest GPS information periodically.
1. Synchronization connection. Make sure that your Pocket PC is
connected to the PC, and that the PC is online.
2. Wireless LAN connection.
3. GPRS connection.
2-6
When the GPS data has expired,
the relevant message displays on
the top of the screen.
The icon reminds you that your
GPS data has expired.
Tap the Notification Button to
open the message window.
Tap to close the message window.