05.03.2013 Views

Data Hacking

Data Hacking

Data Hacking

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

s.s Time in seconds since last update<br />

#### DGPS station ID<br />

*hh Checksum<br />

VTG (Actual Track Made Good and Speed Over Ground)<br />

This sentence provides the velocity made good information.<br />

$GPVTG,t,T,?,??,s.ss,N,S.SS,K*hh<br />

t Track made good<br />

Chapter 9 — Examining the <strong>Data</strong><br />

T Fixed text T indicates that track made good is relative to true north<br />

? Not used<br />

?? Not used<br />

s.ss Speed over ground (measured in nautical miles)<br />

N Fixed text N indicates that speed over ground is in knots<br />

S.SS Speed over ground (measured in kilometers/hour)<br />

K Fixed text K indicates that speed over ground is in kilometers/hour<br />

*hh Checksum<br />

RMA (Navigation <strong>Data</strong> from Present Position)<br />

This sentence provides navigational data based on current position.<br />

$GPRMA,A,llll.ll,e,yyyyy.yy,f,?,??,ss.s,ccc,zz.z,a*hh<br />

A <strong>Data</strong> status (A = OK, V = Void)<br />

1111.11 Destination waypoint latitude<br />

e N or S (for latitude)<br />

yyyyy.yy Destination waypoint longitude<br />

f E or W (for longitude)<br />

? Not used<br />

?? Not used<br />

s.ss Speed over ground (measured in nautical miles)<br />

ccc Course over ground<br />

z.z Magnetic variation (easterly variation is subtracted from True course)<br />

a E or W (for magnetic variation)<br />

*hh Checksum<br />

201

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!