How can I pull the address from a field type that is not Address?

The Maps Premium View requires to setup an address field as the source to geocode the map markers. That Address field is by default a standard Gravity Forms address field type. 

You may select which address field you want to use under the View settings metabox > Maps, address field setting:

What happens when you have stored the entry address in a different field type (e.g. Single Line Text) ?

Override the Address Field setting

since version 1.0.4

In order to override the Address Field setting, you may use the filter hook gravityview/maps/markers/address/field_id as in the following example: