[Ref AIPHK, Google, pgc.umn.edu]

Format of coordinate

1. Decimal Degrees (DD)
2. Degrees Decimal Minutes (DDM)
3. Degrees Minutes Seconds (DMS)

There are various formats and the difference is the accuracy.

Now, let’s take a look on an example:

According to the HK AIP – E1 (Parking Stand)  221847.75N 1135604.77E

Obviously, it is 22° 18′ 47.75”  N  113° E 56′ 4.77″ E – DMS format.

 

To convert the DMS back to DDM – the second (“) needs to be divided by 60, So

N 22° 18.7958    E 113° 56.0795 – DDM format.

 

To convert the DDM back to DD – the minute (‘) needs to be divided by 60, So

22.313263 N   113.934658 E – DD format.

 

In contrast, from DD → DDM → DMS are just thinking opposite – x 60 by steps:

0.313263 * 60 = 18.79578

0.79578 *60 = 47.75

 

Use the link below to X-check your answer:

Coordinate Converter