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You need to know how deep the water is under your hull. You also need to know the depth of water all around and the locations of any channels. I believe the best way to have that know ledge regardless of weather and light conditions is to have a combination GPS and depth sounder. It will probably provide all the information you need.

You should also have a chart of your waters in case of electronics failure.

Highly recommended (IMO essential) is a Safe Boating Course available from the US Power Squadron and the USCG Auxiliary. Others provide these courses depending upon your location.