NorthStar 8700 Technical Reference Manual page 56

Section 10 - NMEA protocols
Field type
Latitude
Longitude
Time
Defined field
Numeric value fields
Variable
numbers
Fixed HEX
field
Information fields
Variable text
Fixed alpha
field
Fixed num-
ber field
Fixed text
field
NOTES:
1. Spaces can't be used in variable text field.
2. A negative sign "-" (HEX 2D) is the first character in a field if the value is negative. The
sign is optional if the value is positive.
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Symbol Description
Fixed/variable length field:
llll.ll
degrees/minutes.decimal - two fixed digits of degrees and
minutes, and a variable number of digits for decimal-frac-
tion of minutes. Decimal point and associated decimal-frac-
tion are optional if full resolution isn't required.
Fixed/variable length field:
yyyyy.yy
degrees/minutes.decimal - three fixed digits of degrees; two
fixed digits of minutes; and a variable number of digits for
decimal-fraction of minutes. Decimal point and associated
decimal-fraction are optional if full resolution isn't
required.
Fixed/variable length field:
hhmmss.ss
hours/minutes/seconds.decimal - two fixed digits of hours,
minutes, and seconds, and a variable number of digits for
decimal-fraction of seconds. Decimal point and associated
decimal-fraction are optional is full resolution isn't
required.
— Some fields are specified to contain pre-defined constants,
mostly alpha characters. Such a field is indicated in this
standard by the presence of one or more valid characters.
The following characters are excluded from the list of
allowable ones, which are used to indicate field types: " A ,"
" a ," " c ," " hh ," " hhmmss.ss ," " llll.lll ," " x ," " yyyy.yy ."
Variable length integer or floating numeric field. Optional
x.x
leading and trailing zeroes. Decimal point and associated
decimal-fraction are optional if full resolution isn't
required. (Example: 73.10 = 73.1 = 073.1 = 73.)
Fixed-length HEX number only, MSB on the left
hh_____
Variable-length valid character field
c-c
Fixed length field of upper- or lower-case alpha characters
aa_____
Fixed length field of numeric characters
xx_____
Fixed length field of valid characters
cc_____
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