Hi all! I am currently in the market for a new fishfinder. The Navman 4600 caught my eye with its nice big screen and its compatibility with Mercs (shows guages on screen). I have no experience with Navmans and don't know what they are like reliability wise... I would appreciate any advice anyone could throw my way so I can make an informed choice. I guess I'm looking for ease of operation, clarity of screen (day and night), accuracy and reliability. Also, is through hull better than transom mount - or is it simply a matter of preference? I have a Powercat 288 (which I love ) with twin Merc 225s (boy, do they go!! ) and fish mainly in the waters around Moreton Bay. Cheers!