You can inspect the Account address detail as an example of integration with OpenStreetMaps in the system and Field Force application as an example of maps functionality on mobile apps.
Thanks Angela, I tried in Account address detail, by clicking it map is opening, what I need is that user should be able to pin location on the map, then will capture the coordinates(long/lat) and save it back in case edit page in mobile. Do you have any sample for this.
Try checking Field Force application as well as it contains map for mobile application. Unfortunately we do not have any example of such customisation.