Sony NW-ZX2 Manual page 59

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Move your Walkman as little as possible in an area where there are no tall
buildings and trees around until the current location is displayed by the GPS
function. The current location can be displayed more quickly when stationary than
while moving. If the current location is not displayed or if the wrong location is
displayed, check the following notes.
When other electronic devices are near your Walkman, electromagnetic waves or
magnetic interference from these may prevent the Walkman from providing
accurate location information. Keep other electronic devices away from the
Walkman.
When in an area with poor reception of GPS signals, you may encounter
positioning errors. To receive more accurate information, avoid using your
Walkman in the following locations.
Inside buildings or in vehicles such as cars and trains
In tunnels or underground
Under elevated tracks
Between tall buildings
In dense trees
In valleys
If the wrong location is displayed, turn off the wireless network temporarily. See if
the location information improves before turning on the wireless network again.
The GPS antenna ( ) is built in to your Walkman. If you cover the antenna (
with your hands or other objects while using the GPS function, the positioning
accuracy may decrease.
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