Very useful
Worked really well in the better travelled areas but when you get out into some of the neighborhood, eg, around the Chora church, the maps get very sketchy. Love that it works offline since I have a touch. love that I can add venues and share so that the data gets better and better. Putting in addresses was a bit challenging since Turkish addresses follow different conventions and search sometimes had trouble in Istanbul. But sure beat a heavy book when in the more frequented areas. Supplements but does not replace a guide book for reference info.
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Istanbul Travel Guide (with Offline Maps) - mTrip