E-42
Uniden UM725 Radio Owner’s Manual
NMEA OPERATION
Your radio supports NMEA 0183 (version 4.10), a standard for data communication
between marine instruments. NMEA sentences contain different sets of data related to
your ship. When your radio receives another boat’s position data in a DSC call, the radio
sends the position data to the chartplotter so you can see the location:
Additionally, the UM725GBT and UM725G models provides a NMEA 2000 port for
connecting to GPS along with the standard NMEA0183. See "NMEA2000 PGN LIST
(UM725GBT / UM725G ONLY)" on page E-55.
NMEA0183 INPUT
The UM725 supports the following sentences:
DATA
RMC GLL GNS GGA ZDA
UTC Time
O
O
O
O
O
Status (Valid/IInvalid)
O
O
O
O
X
Latitude/Longitude
O
O
O
O
X
Speed
O
X
X
X
X
Course
O
X
X
X
X
Date
O
X
X
X
O
X = Data Not Provided
O = Data Provided
When the radio receives a DSC call (Distress, Position Reply, or Position Send), it outputs
a DSC/DSE sentences from the NMEA output port in the following formats:
x
$CDDSC,12,3081234000,,07,00,0354013946,0657,,,S,E*6D
x
$CDDSE,1,1,A,3081234000,00,60875646*13
If some sentences are received (ex. RMC and GLL), the radio use the information based
on the following priority order.
x
Status: RMC > GLL > GNS > GGA
x
Latitude/Longitude: RMC > GLL > GNS > GGA
x
UTC Time: RMC > GLL > GNS > GGA > ZDA
x
Date: RMC > ZDA
x
Speed / Course: RMC
1) For example, if th e radio received only GLL sentence, the radio cannot display speed,
course, and date.
2) 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.
The radio supports RMC, GLL, GNS, GGA and ZDA sentence. When these sentences
were received, the radio displays latitude/longitude, date, time, course, and speed. Each
sentence includes the following information.