Sony NV-U50 User Manual page 63

No GPS reception?
Navigation
When the received GPS signal is not sufficient, the following
message appears:
You have two possibilities:
Wait until navigation starts. This will happen as soon as the
GPS reception is sufficient.
Tap Cancel and restart navigation as soon as the reception of
GPS signals is convenient. You may notice that by watching
the GPS symbol on the screen: it becomes GPS ready when
the reception is good.
User's manual Sony Personal Navigation System
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