Data Logs
Appendix C
SPAN-SE User Manual Rev 1
169
Field Type
Symbol
Definition
Special Format Fields
Status
A
Single character field:
A = Yes, Data Valid, Warning Flag Clear
V = No, Data Invalid, Warning Flag Set
Latitude
llll.ll
Fixed/Variable length field:
degrees|minutes.decimal - 2 fixed digits of degrees, 2 fixed digits of mins and a variable
number of digits for decimal-fraction of mins. Leading zeros always included for
degrees and mins to maintain fixed length. The decimal point and associated decimal-
fraction are optional if full resolution is not required.
Longitude
yyyyy.yy
Fixed/Variable length field:
degrees|minutes.decimal - 3 fixed digits of degrees, 2 fixed digits of mins and a variable
number of digits for decimal-fraction of mins. Leading zeros always included for
degrees and mins 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:
hours|minutes|seconds.decimal - 2 fixed digits of hours, 2 fixed digits of mins, 2 fixed
digits of seconds and variable number of digits for decimal-fraction of seconds. Leading
zeros always included for hours, mins and seconds to maintain fixed length. The decimal
point and associated decimal-fraction are optional if full resolution is not required.
Defined field
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 which are used to
indicate field types within this standard:
"A", "a", "c", "hh", "hhmmss.ss", "llll.ll", "x", "yyyyy.yy"
Numeric Value Fields
Variable
numbers
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)
Fixed HEX
hh___
Fixed length HEX numbers only, MSB on the left
Information Fields
Variable text
c--c
Variable length valid character field.
Fixed alpha
aa___
Fixed length field of uppercase or lowercase alpha characters
Fixed
xx___
Fixed length field of numeric characters
Fixed text
cc___
Fixed length field of valid characters
NOTES:
1.
Spaces may only be used in variable text fields.
2.
A negative sign "-" (HEX 2D) is the first character in a Field if the value is negative. The
sign is omitted if the value is positive.
3.
All data fields are delimited by a comma (,).
4.
Null fields are indicated by no data between two commas (,,). Null fields indicate invalid
data or no data available.
5.
The NMEA Standard requires that message lengths be limited to 82 characters.
