Photo app to easily add comments and date stamps. It can also edit location by address, coordinates and by dragging a pin on a map.

What Pic Navi can do:
Opening a map to navigate back to photo location.
Copying the GPS coordinate of the photo.
Adding / Modifying / Deleting the photo's location.
Modifying the photo's timestamp.
Showing the timestamp in the photo's location (Timezone support)
Showing / Inscribing the timestamp inside the photo.

To see the map, tap the compass icon. To modify GPS, long-press the icon.
To change the appearance of the timestamp, tap the timestamp. To modify it, long-press it.