Auto routing anyone?

[Randomandy]

Does anybody have experience using auto routing of a chart plotter? Garmin calls this "Guidance". I'm referring to an algorithm that can find a path between two points but automatically detour around the shallows, as opposed to the typical setup that draws a straight line even if it crosses land or rocks.

All of you who don't trust electronics, I get it. Please do not hijack this thread to say so unless you have actually tried to use autoguidance. Thank you.

What were you results? Did it succeed? fail? somewhere in between?