The portage into the little pond KF talks about off of Ferguson, it was full of floating grass mats. I've moved small ones over from my canoe before, but here I discovered I could stand on the larger ones till they sank enough to paddle over them. They sink slow and rise slow too. I was coming from the river end of the portage. I believe I put way point coordinates in the portage database too. Might be a different format than MP's if that helps.