Yes, as stated, I have no trouble unlocking the newer cityXplorer maps(s). The unlocked maps work fine on the 37xx but when they are unlocked using any Garmin unlocker, they will not use cityXplorer's enhanced navigation Public Transit modes which will route you on Bus, Train or Metrorail. When the cityXplorer maps are properly being used, the Pedestrian Transportation mode will state "Powered by cityXplorer". The unlocked maps do not state this and do not use the Bus, Train or Metrorail to route you. I have some older version cityXplorer maps (Los Angeles, Venice) that -do- work correctly with the .unl file and the 37xx series. The newer cityXplorer maps do not work correctly because they require the additional .gma protection file/key to enable the enhanced transit modes.