Installation manual

SimradPI50
GGAGlobalpositioningsystemxdata
Thistelegramcontainstime,positionandxrelateddatafromaglobalpositioning
system(GPS).
Format
$--GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,
x,zz,d.d,a.a,M,g.g,M,r.r,cccc*hh<CR><LF>
Formatdescription
1––=talkeridentier
2GGA=telegramidentier
3hhmmss.ss=coordinateduniversaltime(UTC)ofposition
4llll.ll,a=latitudenorth/south,positionindegrees,minutesandhundredths.
CharactersN(North)orS(South)identiesthebearing.
5yyyyy.yy,a=longitudeeast/west,positionindegrees,minutesandhundredths.
CharactersW(West)orE(East)identiesthebearing.
6x=GPSqualityindicator(refertotheNMEAstandardforfurtherdetails)
7zz=numberofsatellitesinuse,00to12,maybedifferentfromthenumberinview
8d.d=horizontaldilutionofprecision
9a.a,M=altituderelatedtomeansealevel(geoid)inmeters
10g.g,M=geoidalseparationinmeters
11r.r=ageofdifferentialGPSdata
12cccc=differentialreferencestationidentication,0000to1023
HDGHeading,deviationandvariation
Thistelegramcontainstheheadingfromamagneticsensor,whichifcorrectedfor
deviationwillproducemagneticheading,whichifoffsetbyvariationwillprovidetrue
heading.
Format
$--HDG,x.x,z.z,a,r.r,a*hh<CR><LF>
Headingconversions
Toobtainmagneticheading:Addeasterlydeviation(E)tomagneticsensorreading,or
subtractwesterlydeviation(W)frommagneticsensorreading.
Toobtaintrueheading:Addeasterlyvariation(E)tomagneticheading,orsubtract
westerlyvariation(W)frommagneticheading.
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