Uniden UM455 Owner's Manual page 52

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Maintenance and Troubleshooting
Problem
I'm not getting any GPS data
on my display.
I can't make Group DSC calls.
Where can I find my radio's
serial number?
The radio won't let me enter
my User MMSI. What do I do?
Things to Try
Make sure your GPS receiver is correctly
connected (see Connecting to a GPS receiver).
Make sure your GPS receiver is working properly.
Make sure that your GPS receiver supports the
NMEA parameters described in NMEA Operation
on page 63.
Make sure the Group MMSI was entered
correctly.
Look on the bottom side of the radio
Contact customer service by visiting the customer
support page on www.uniden.com.au.
52

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