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I have never used a bottom line. There is a few things you should be looking at and comparing to other compinies. Tradsducer Frequency. Lower frequencies will display a wide area on the bottom while higher frequencies will give you more resolution or detail. For salt water you would want a lower frequency than fresh water. Tranducer beam width or cone angle. The smaller the beam you can pick up small groups of fish in deep water. If you dont fish deep water, then this may not be as important. Output power. Too much power in shallow water is not good. Power ranges will be between 100-1000. How will you mount the unit? transum, through hull? if you pick the right machine for your style of fishing you will be the most happy.
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