hi i was thinking the same !! if you go into my locations and instead of typing in the place you want the tide for go to the map and zoom in until you get the place you want then click on it. i.e.i was looking for tide time at burrum heads hope this helps hope this is what you were asking!!
If I am understanding your question correctly, no. The tide will be as per the tide station. But tide stations will (should) list offsets for their local area. The largest I have every seen is 3 hours.
Mark is the expert in this field. It might be possible to add a feature to allow manual input for time offsets. I will ask him about it next time we chat.
itsaboat mate...Life is just a boat and then ya marry one !