Unfortunately, it’s not a given that all fish finders are waterproof, but in the majority of instances, they just should be. It totally depends on the make and model, so it’s best to read the manufacturers specifications thoroughly. Some may be able to survive splashes but not submersion adequately, so we do recommend that you ideally look for a fish finder that has some rated level of waterproofness. Accidents do happen, especially when you are around water and a fish finder is not exactly an inexpensive purchase. Taking precautions course will help but perhaps do yourself a favor and avoid the headache of finding out to your detriment and cost that your portable fish finder isn’t waterproof after all by checking the specs first!\r