Appendix; Nmea Operation; Nmea Input; Nmea Output - Uniden UM525 Owner's Manual

UM525 Paper OM.fm Page 54 Tuesday, January 4, 2005 2:54 PM

Appendix

NMEA Operation

This radio supports NMEA0183 version 3.01.

NMEA Input

The radio supports RMC, GLL, GNS, GGA and ZDA sentences. When these
sentences are received, the radio displays latitude/longitude, date, time, course, and
speed. Each sentence includes the following information.
RMCGLLGNSGGAZDA
UTC Time?????
Status (Valid/Invalid)????×
Latitude/Longitude????×
Speed?××××
Course?××××
Date?×××?
If some sentences are received (ex. RMC and GLL), the radio uses the information
based on the following priority order.
Status:RMC > GLL > GNS > GGA
Latitude/Longitude:RMC > GLL > GNS > GGA
UTC Time :RMC > GLL > GNS > GGA > ZDA
Date:RMC > ZDA
Speed / Course:RMC
Notes:
• For example, if the radio received only a GLL sentence, the radio does not display
speed, course, and date.
• For example if both RMC and GLL sentence, the radio will use information of
RMC sentence.
Status data is used to check which the GPS data is valid or invalid.

NMEA Output

When the radio receives a DSC Call (Distress, Position Reply, Position Send), it
outputs a DSC/DSE sentence from the NMEA output port.
Note: When the radio receives a Distress call, it outputs a sentence in the following
format.
$CDDSC,12,3081234000,,07,00,0354013946,0657,,,S,E*6D
$CDDSE,1,1,A,3081234000,00,60875646*13
54
Appendix
Appendix