Miles, mostly Wabigoon lake, just east of Eagle lake.
Then why don't you just mark it with a jug and a rock on a rope? That's legal in Ontario. If the problem is the finding of the reef then ask someone with a depth finder to mark it for you. Wabigoon has to be 100 square miles of water and I can't imagine fishing it without a depth finder. Or a GPS for that matter. Both of which can be had very cheaply nowadays. What am I missing here?
