How do you fish bigger lakes?

I sometimes fish open water in big lakes, and I never catch anything. I normally fish in a pack raft, and I beach the boat when I want to fish, so the boat is essentially just me taxi, not my actual fishing vessel. I target anything from pike to lake trout to rainbows, anything you can find in Alaska, where i live. I think the main reason I don't catch anything is because i am bad at judging spots.  How could I find good fishing spots without and GPS/ Fish Finder?  And what should I look for in fishing spots?

mindcrime8282020-11-24T17:49:44Z

If you don't want to invest in electronics, you could look to see if there are lake maps available.  While some of the information is often dated, it should provide the general topography of the lake so you can see where there are points, humps, dropoffs, etc along with the type of bottom in those areas (grass, weeds, sand, rock, etc) and what kind of fish you may find there.  Also may want to ask people at the local bait shop or if you see other anglers for any tips or advise.  They may not tell you their hot spots, but could give a few nuggets to help learn the lake better,