Millisecond To Degree Conversion; Fox Pcmcia Step-By-Step Data Collection & Conversion - Berkeley Varitronics Systems Fox Manual

Millisecond to Degree Conversion

The primary output message of Oncore receivers is the Position/Status/Data Message (@@Ea). In this message, the latitude and
longitude are reported in milliarcseconds. This note describes how to convert milliarcseconds to degrees.
One degree of latitude or longitude has 60 arcminutes, or 3600 arcseconds, or 3,600,000 milliarcseconds.
To convert the positive or negative milliarcseconds to a conventional degrees, minutes, seconds, format follow this proce-
dure:
• Divide the milliarcsecond value by 3,600,000
• The integer portion of the quotient is the degrees
• Multiply the remaining decimal fraction of the quotient by 60
• The integer portion of the product is the minutes
• Multiply the remaining decimal fraction of the product by 60
• The integer portion of the product is the seconds
• The remaining decimal fraction of the product is the decimal sounds
CONVERSION EXAMPLE:
Michigan Avenue, Chicago, IL:
Latitude=150748869 mas
150748869/3600000=41.87468583
Degrees=41
0.87468583*60=52.48114980
Minutes=52
0.48114980 * 60=28.868988800
Seconds=28
Decimal seconds=0.868988
Latitude=41˚52'28.869"
Conversion formula for changing Latitude and Longitude in degrees and decimal minutes for older versions of Fox:
Lat = Deg + (Dec Minutes / 60)
Lon = Deg + (Dec Minutes / 60)
Longitude=-315445441 mas
-315445441/3600000=-87.62373361
Degrees=-87
-0.62373361*60=37.42401660
Minutes=37
-0.42401660 * 60=25.44099600
Seconds=25
Decimal seconds=0.440996
Longitude=87˚37'25.441"
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