Storing GPS coordinates in a MySQL database

1146765 pts.
Tags:
Database
MySQL
We have a MySQL database that carries both longitude and latitude (GPS data). Here's how it's stored:
column     type
------------------------
geolat     decimal(10,6)
geolng     decimal(10,6)
Here's our question: Do we really need a data type that's large as "decimal(10.6)" to properly store the data?
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