The key factor is your budget. 150.00 to 3000.00 lot of good inexpensive units out there if you just want a depth finder that will show brush and stuff without a lot of detail. Agree with P61 that the color units are way better especially if your eyes are like mine and getting tired. Remember your budget. Look at Cabelas and BPS web site find something you like and call Brian at BBG marine who is a member sponsor on here for your best deal and I'm not affiliated with them in any way.