I have to chime in on this one LOL.
Assuming no maps, no electronics, no phone.
Look at your vegitation on the bank. Different vegetation types will help you. more Pine trees generally denotes the area being sandier. Sandier will facilitate better spawning habitat for bream, bass, etc. Gum trees in my area (Va) grow in boggy wet bottoms or lower areas. If these are on the banks that area is more likely to be shallower close to the bank with a soft bottom.
Learn to read the vegetation in the water. Thinner areas within an area of vegetation may mean a depth change and that area is deeper. using this method in lilly pad fields help to identify deeper gullies used by beavers or where the old creek or spring is. This works the same in Hydrilla but not as well since it can grow so deep. Vegetation type is also a big thing. Reeds, cattails, hydrilla, lilly pads, etc. all have a preferred bottom substrate. Lilly pads love mud/muck, Hydrilla likes everthing, Cattails like mud as well. I am not super versed on this but the oracle would have that information. Look for different colors in the vegetation or a change in type/mixed types.
When reading the topography look for features on the bank, they extend into the water. If you see something (rock, point, etc) extended into the water, look across the lake for a matching feature. If you see it, you just found a saddle or structure element that extends the distance between them.
that is all I have right now. I fish a lot with my electronics off on purpose. Keeping the old skills is important.