Heading modes for Waypoints

What are Auto (TNW), Initial (ID), Manual (UC) and Custom (WD) modes and how to use them?
So far I figured that Auto would follow direction of next waypoint and Custom allows to set heading to POI direction. How do you set waypoint at aircraft?

Read chapter ‘Mission Settings’ in the Online User Guide:

Read this thread:

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Thank you!! I went through your instructions and the post it was helpful