TIP-UP:
Hey..I really think on the Body of water your fishing.. Shallow, 18 feet would be the deepest spot? Mid Depth..40 feet deepest, Deep..and REALLY DEEP..220 feet..
I like to go on the Bays and Inlets of Waters like Gun Lake in Barry County. It has plenty of Inlets, that are really only about 7 Feet deep. Try to find the Weed Spots, or tangle with the people on the Ice. AND...If you really want to find fish, Take a Drive along a Body of water and "LOOK THROUGH YOUR BONOCULARS...

" With all the Arms going UP I can almost guarentee you that They AREN'T WAVING at ya..They're either catching FISH, or MISSING them..
Good LUCK..
Stan