Another possibility is that the base map is in a different coordinate system than the coordinates in the post map data file. If you are using data from different coordinate system to create your maps, then be sure you are selecting the correct coordinate system for each layer and the map frame so that all the data can be displayed correctly. To do this:
- Select each layer in the Object Manager and in the Property Manager click the Coordinate System tab.
- Click the Set button and make sure you set the coordinate system as appropriate for the source data file for that layer.
- Then select Map in the Object Manager, and in the Property Manager click the Coordinate System tab.
- Click the Change button and assign a coordinate system for the map to be displayed in.
Updated January 17, 2017