I see no forum for the chart plotter, so this is the best I can do to find a related forum. I put in a waypoint, and then chose "navigate to" which uses the autoguide feature. I was going to a marina in Key Biscayne FL at that waypoint. The unit plots out a purple line, which I followed exactly. When going through government cut, towards the port of miami, you can veer left through "Fisherman's channel", which is the backside of the port of miami. The garmin led me out about 300 yards away from the port, instead of hugging the wall of the port. I ran aground in less then a foot of water. I ended up damaging my props. I was under the (obviously false) impression that the autoguide feature took into account safe navigable depth in plotting its course. It did not, and I can no longer trust that feature of the unit any more. Not good. I am guessing at this point, I will have to manually plot a course of safe navigable waypoints first, and then create a route from that. Is there some setting on the unit that will tell it "when using autoguide, do not plot a course through water less than 5 feet" ?
Dave