With the Maps Migration tool you can migrate your old Gmaps fieldtype field to the new Maps fieldtype field.
Currently, it only supports migration from the old Gmaps to the new Maps module
Make sure your system meets the minimum requirements:
When you move all the files to the correct location, you can navigate to the module CP and just start the migration. That's it ;-)
important: before starting, make sure you make a backup of your old data, in case of failure.