[GPSNavX]

Try moving the detail slider over to the right on the MacENC toolbar. This will allow you to see Harbor detail (if it exists) while still at an Approach scale.

MacENC only displays the cells (charts) which are the same or smaller scale of the selected zoom scale. So if you want to see more detail (if it exists) sliding the detail slider to the right will expose it. The downside is you may see excessive clutter.