NorthStar 2505 Installation Manual page 35

Field type
Status
Latitude
Longitude
Time
Defined field
Variable
numbers
Fixed HEX field
Information
Fields
Variable text
Fixed alpha
field
2505 INSTALLATION MANUAL, Revision A
Table 6: NMEA field definitions
Symbol Definition
Special format fields
A Single character field:
A = Yes, Data Valid, Warning Flag Clear
V = No, Data Invalid, Warning Flag Set
llll.ll Fixed/Variable length field:
Degrees/minutes.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.
yyyyy.yy Fixed/Variable length field:
Degrees/minutes.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.
hhmmss.ss Fixed/Variable length field:
hours/minutes/seconds.decimal - 2 fixed digits of hours, 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.
Some fields are specified to contain predefined 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 which are used
to indicate field types within this standard: "A", "a", "c", "hh",
"hhmmss.ss", "llll.ll", "x", "yyyyy.yy".
Numeric Value Fields
x.x Variable length integer or floating numeric field. Optional
leading and trailing zeros. The decimal point and associated
decimal-fraction are optional if full resolution is not required.
(example: 73.10 = 73.1 = 073.1 = 73)
hh_______ Fixed length HEX number only, MSB on the left.
c--c Variable length valid character field.
aa_____ Fixed length field of upper-case or lower-case alpha
characters.
Appendix C NMEA output protocol
Page 25