Motorola M12 Oncore User's Guide download pdf (Page 40)

Chapter 3 – Receiver Description

Motorola GPS Products - Oncore User’s Guide

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 procedure:

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 seconds

CONVERSION EXAMPLE:

Michigan Avenue, Chicago, IL:

Latitude = 150748869 mas Longitude=-315445441 mas

150748869 / 3600000 = 41.87468583 -315445441 / 3600000 = -87.62373361

Degrees = 41 Degrees = -87

0.87468583 * 60 = 52.48114980 -0.62373361 * 60 = 37.42401660

Minutes = 52 Minutes = 37

0.48114980 * 60 = 28.86898800 -0.42401660 * 60 = 25.44099600

Seconds = 28 Seconds = 25

Decimal seconds = 0.868988 Decimal seconds = 0.440996

Latitude = 41º 52'28.869" Longitude = -87º 37'25.441"

Revision 5.0 08/30/02

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Motorola M12 Oncore User's Guide Page 40