Leica Geosystems GPS System 500 - Technical Reference Manual - Manual (Page 327)

327 Appendix E Technical Reference Manual-4.0.0en
Numeric Value Fields
x.x Variable numbers Varaible length integer or floating
numeric field. Optional leading and
trailing zeros.
(example: 73.10 = 73.1 = 073.1 = 73)
hh_ Fixed HEX field Fixed length HEX numbers only
Information Fields
c--cVariable text Variable length valid character field
aa_ Fixed alpha field Fixed length field of upper-case or
lower-case alpha characters
xx_ Fixed number field Fixed length field of valid characters
GGA - Global Positioning System Fix Data
Format
$GPGGA,
hhmmss.ss,
llll.ll,
a,
yyyyy.yy,
a,
x,
xx,
x.x,
x.x,
M,
x.x,
M,
x.x,
xxxx
*hh
Content
Header, incl. Talker ID, message sent from
Receiver
UTC time of Position
Latitude
Hemisphere “N”/“S”
Longitude
“E”/“W”
GPS Quality Indicator
0 = fix not available or invalid
1 = No Realtime position, navigation fix
2 = Realtime position, ambiguities not fixed
3 not existing
4 = Realtime position, ambiguities fixed
Number of satellites in use, 00-12
HDOP
Antenna altitude above/below mean sea level.
Note, if no orthometric height is available the
local ell. height will be exported. If the local ell.
height is not available either, the WGS84 ell.
height will be exported.
Units of altitude meters (fixed text “M”)
Geoidal separation
Units of geoidal separation meters (fixed text
“M”).
Age of differential GPS data, null when DGPS
not used
Differential Reference Station ID, 0000-1023
Checksum
Carriage Return
Line Feed