I’d be curious to know how experienced users ensure that they’ll remain in contact with their drone when launching from a location surrounded by higher hilly terrain. Is it as simple as looking at a vertical profile of the mission and confirming line of sight between the most distant waypoint and Home?
The “Google Earth” view is very handy for determining sight lines.

Ah, thanks for that. I was using a separate iteration of Google Earth not being entirely familiar with the user interface. Is there a hack for determining the maximum safe cruising speed for flying an AGL specified mission over irregular terrain?
I know of no special tool for something like that. I would suggest simply flying at a reasonable speed for the height of your mission.
Sound advice. Is there a max efficiency speed that allows the bird to cover the maximum distance per unit of battery life?
There probably is but it would be different for each drone. I have heard people say that the max speed in normal mode of your drone is the most efficient. You would have to test this and see what results you get.
Great, thanks. Is that icon grab that you posted early in our conversation from the new beta version of Mission Hub? I don’t see them anywhere on the original version, on a Mac if that matters.
Yes. That is from the new Hub. The old Hub does not have the Google Earth option built in.