Greetings
Most of the time approaches use Locator and they are co located with Markers as stated by Ocampo, NDB are more associated with routes (Airways), now some airports have DNB approaches, one stone two birds, it is because NDB is needed for the route over the airport.
The consol was an NDB with 400 NM ranges, one was in Norway stavengar, one was in Malta Gozo, one in Sardegnia, they have been decommissioned, Locator has 15 NM range.