Uncle Phil
Site Supporter
Ah, all this complexity just to get guidance to where you are going.
That's the reason I love my simple, cheap Chinese GPS units - easy to update, easy to do routes, easy to change routes on the fly, icon for throwing away errant waypoints, etc. It was easy to solve the involuntary exodus of the unit if the security screw gets loose - I cut a short piece of aluminum with a rubber strip on the end, velcroed it to the cradle sun hood so it light presses again the top of the unit, got a cheap office paper clamp on the end of it, and problem solved. 
