I am with Fishtale on this one. I have two combo units on my boat-both Lowrances. I have the older LMS350A which is just a plotter with a blank screen and you put in the info. It also has the fishfinder which has a ton of power to read deep water. Next I have the newer Lowrance LCX15MT. It is a combo. I love this unit and it is fully upgradable over the internet. The Navionics charts you buy for them (which have come down in price tremendously) always had the tide and current info. When I bought the unit it did not have this. I fully upgraded it over the internet several times now. The tide and curent info is in it now. This baby has 3000 watts of power and You can actually see shrimp on the bottom for setting shrimp pots. It is very clear reading. I am very satisfied with these units. You need a lot of power if you go in deep saltwater. What ever you choose, make sure the transducer has less than 200 KHZ. This will read the best in saltwater and for deep bottoms. I can read over 800 feet in saltwater with these. I like to halibut fish in the ocean and some fishfinders cannot handle this. I also carry a spare handheld on board too. I really like the fine pixels on the LCX15. If you have a cell phone and have a question while on the water you can call customer support and they will tell you the answer. Both of these units do a million and one things. I am sold on Lowrance. PS I bought my maps before you could get a huge map for $299. Mine were 299.00 each. Still happy with it tho. Just my opion. Good luck.