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Specifications
NMEA Operation
This radio supports NMEA0183 version 3.01.
NMEA Input
If you have difculty getting the UM425 to receive data from your GPS receiver,
check the device’s conguration. It should be set to the parameters shown in the
table below.
Table 13 - NMEA Input Parameters
Baud rate 4800 bps
Data bits 8
Parity None
Stop bits 1
Data amplitude Over 3.0 V
Drive capability Over 10 mA
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. If
any sentence except an RMC or
GLL sentence is received, 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 :
• If the radio receives only a GLL sentence, the radio does not display the
current speed, course, and date.
• If the radio receives both RMC and GLL sentences, the radio uses only
the RMC sentence.
• Status data is used to check whether the GPS data is valid or invalid.
NMEA Output
When the radio receives a DSC call (Distress, Position Reply, or 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
Table 12 - Canadian Channel Frequencies and Channel Tag (cont'd)
UM425 VHF OM.indd 63 28/9/11 11:55:23 AM