DR + GPS
STARTER KIT REFERENCE MANUAL
Lassen DR + GPS Reference Manual 37
FIELD DEFINITIONS
Many of the NMEA date fields are of variable length, and the user should always
use the comma delineators to parse the NMEA message date field. Table\
specifies the definitions of all field types in the NMEA messages supported by
Trimble

Table 3: Field Type Summary

Type Symbol Definition
Status A Single character field:
A=Yes, data valid, warning flag clear
V=No, data invalid, warning flag set
Special Format Fields
Latitude llll.lll
Fixed/variable length field:
Degreesminutes.decimal-2 fixed digits of degrees, 2 fixed
digits of minutes and a variable number of digits for
decimal-fraction of minutes. Leading zeros always
included for degrees and minutes to maintain fixed
length. The decimal point and associated decimal-
fraction are optional if full resolution is not required.
Longitude yyyyy.yyy
Fixed/Variable length field:
Degreesminutes.decimal-3 fixed digits of degrees, 2 fixed
digits of minutes and a variable number of digits for
decimal-fraction of minutes. Leading zeros always
included for degrees and minutes to maintain fixed
length. The decimal point and associated decimal-
fraction are optional if full resolution is not required.
Time hhmmss.ss
Fixed/Variable length field:
hoursminutesseconds.decimal-2 fixed digits of minutes, 2
fixed digits of seconds and a variable number of digits for
decimal-fraction of seconds. Leading zeros always
included for hours, minutes, and seconds to maintain
fixed length. The decimal point and associated decimal-
fraction are optional if full resolution is not required.
Defined Some fields are specified to contain pre-defined
constants, most often alpha characters. Such a field is
indicated in this standard by the presence of one or more
valid characters. Excluded from the list of allowable
characters are the following that are used to indicated
field types within this standard:
“A”, “a”, “c”, “hh”, “hhmmss.ss”, “llll.ll”, “x”, “yyyyy.yy”