Printed Documentation
B2: Used symbols for describing the NMEA formats
Background information
NMEA messages consist of various fields. The fields are:
•
Header
•
Special format fields
•
Numeric value fields
•
Information fields
•
Null fields
Certain symbols are used as identifier for the field types. These symbols are described in this section.
Header
S mbol
y
Field
Description
Example
$
-
Start of sentence
$
--ccc
Address
•
-- = alphanumeric characters identifying
the talker
Options:
GP = GPS only
GL = GLONASS only
GN =
G
lobal
N
avigation
S
atellite
S
ystem
•
ccc = alphanumeric characters identifying the
data type and string format of the successive
fields. This is usually the name of the
message.
GPGGA
Special format fields
S mbol
y
Field
Description
Example
A
Status
•
A = Yes, Data Valid, Warning Flag Clear
•
V = No, Data Invalid, Warning Flag Set
V
llll.ll
Latitude
•
Degreesminutes.decimal
4724.538950
274
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