Panasonic You can also check the expiration date on the screen when the GPS Assist Tool is

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Reducing the time required for positioning
DMC-ZS20
Checking the expiration date of the GPS assist data
The GPS assist data expires in 30 days. We recommend using new GPS assist data.
Press [MENU/SET]
Use cursor button to select [GPS] menu and press
[MENU/SET]
Use cursor button to select [Assist Data] and press
[MENU/SET]
Use cursor button to select [Expiry Date] and press
[MENU/SET]
●You can also check the expiration date on the screen when the “GPS Assist Tool” is
started up on the computer.