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Have to know what sized boat, what you are planing to do, and what price range. Without knowing the above, I can suggest a pretty good low end system by Raymarine Model A65. Warning, the A65 comes as a system or as just the display. You would want the complete system which goes for around $1700.00 but is heavily discounted just about everywhere. In addition, Raymarine is running a rebate on this unit for $350. The bottom line is you should get the system for under $1000. It comes with a basic chip to give you the coastal charts, and a very good fishfinder. The GPS antenna and sonar transducer are also supplied. You get quite a bit of electronics for the money from a reputable manufacturer. The down side is if the display head goes down, you are out of business so be sure you have an inexpensive hand held GPS on board as a backup (I would make this recommendation to any boater no matter what permanent mount GPS he/she has.) The A65 cannot ever be mated to a radar, so if your intentions are at some future date add a radar, it would have to be a stand alone radar or forget about A65. Lastly, the A65 is not as user friendly as say a similar Garmin unit, but it is not that bad. A couple of hours of practice should have you using it like an expert. I sell these units at West Marine and have had no complaints coming back from customers. Keep in mind, that should you find some internet concern that heavily discounts this product, I would still bring the printout in to my local West Marine dealer to give him/her a chance to do right by you. I never liked the idea of buying expensive electronics through the web since if something goes amiss, there is no one you can go to resolve your problem quickly and/or easily.

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"Success seems to be largely a matter of hanging on after others have let go" by William Feather