[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: