I have used the [ASIN:B000ETTPCG Garmin 160C Portable Fishfinder (Dual Beam)]Garmin 160C several times now and find that it is quite easy to use and it works well not only locating fish but the constant depth reading has saved my boat being hung up in shallow water areas where I fish. The optional audible alarm that I added was a plus as well so you can hear the warning of fish and depth audibly as well as see on the screen both fish and water depth situations.

Great item for the low cost!!