i am not sure if this has been posted already in some other thread but it so happens, google maps have added a few latin american countries for turn by turn navigation. Fortunately, dominican republic is on the list. I have used it on my sony xperia z with android 4.3 and it worked like a charm. It's still in beta stage but its working good so far. I have only tested direction towards pricesmart in santo domingo and it worked good. I do have 3G plan so I am all set to navigate but I am sure you can download the maps of your city and still be able to use it offline. if you are on latest android OS and you have no offline download function then simply zoom into the area you want to download (example: santo domingo) and then type in search "okay maps" this will trigger the map offline download.
enjoy.
AZB
enjoy.
AZB