This app is all about GPS coordinate conversion.
Find a location in map with special coordinate system (WGS84, VN2000 …) and you can save to work next time.
While saving places, if you modify one end of the data (either the geographic or map grid coordinates), the other end will be simultaneously updated, even the annotation on map.
When you tap another annotation on Maps, brief information of this annotation after converting latitude and longitude by proj4 is shown below.
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