Nautilus is an extremely underrated jungler. He has fantastic ganks and is a major asset to any team. You will want to start out with a leash on blue. After that it is regular pathing; wolves, wraiths, red, then golemns. You want to start your ganking at level four when you get your pull. Start top lane the go mid. After that go back to buy your philosophers stone. Nautilus is great because of his ganks and you need to help out lanes often because of this. There is only one downside to jungling Nautilus. That reason is he is a slow jungle clear. Almost any other jungle champ can come in and steal a buff and get out before you get there. Keep that in mind early game and ask your team to help prevent the invade. Late game you will want to sell your Heart of Gold to buy Warmog's Other than that I rarely lose a game with Naut because I am able to feed my ap and ad carries.