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

Format of coordinate

- Decimal Degrees (DD)
- Degrees Decimal Minutes (DDM)
- 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: