Someone made a nifty little flow chart that describes how RTH works based on the difference in distance of the drone from the home point, since the manual can be a little confusing.

https://imgur.com/a/iZuZu

https://i.imgur.com/2vkm3X3_d.jpg?maxwidth=640&shape=thumb&fidelity=medium

Daveddo, the picture you post is a little blurry. Did you read the explanation of the RTH in our user manual? Please turn to page 13 to learn more information.

I'm not sure how to view a larger version of this picture.

Wait:
This increases the size.
https://i.imgur.com/2vkm3X3_d.jpg?maxwidth=1920&shape=thumb&fidelity=large

Some stuff in this is also incorrect/misleading or not sufficiently explained