Bearing/Visual Spotting Tool
Tools to view bearings to objects on charts. This could take multiple forms, such as:
1. Drawing a line from the boat icon in north-up orientation to better see on the chart where the (magnetic) device is pointing
2. Showing a bearing marker (tool) on the screen which would (visually) indicate your bearing to a selected object.
3. "Augmented reality" display of where an object is.
Short problem: there is a marker on your chart - how can you use your iPhone to help spot where it physically is??