In GPS equipment, there are different display methods for coordinate units, such as DMS and DDD. For example, the GPS coordinates in front of the office building of Xi 'an GPS Car Friends Association are as follows:

　　Degrees minute seconds (DMS) : E 108 degrees 54 minutes 22.2 seconds N 34 degrees 12 minutes 60.0 seconds

　　Degrees (DDD) : E 108.90593 degrees N 34.21630 degrees

　　How to convert degrees (DDD): : 108.90593 degrees into degrees minutes and seconds (DMS) E 108 degrees 54 minutes and 22.2 seconds? The conversion method is to change the integer bit of 108.90593 to 108(degrees), use 0.90593*60=54.3558, take the integer bit of 54(minutes),0.3558*60=21.348 and then take the integer bit of 21(seconds), so it is converted into 108 degrees, 54 minutes and 21 seconds.

　　Similarly, DMS: E 108 degrees 54 minutes 22.2 seconds can be converted to DDD as follows :108 degrees 54 minutes 22.2 seconds =108+(54/60)+(22.2/3600)=108.90616 degrees

　　Because of the preservation of decimal places in the calculation, there are some errors in the positive and negative calculation, but the error influence is not very big. The error of one second is a few meters. GPS car friends can use the above method to convert into their own needs of the unit coordinates.

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