Guys, I have recently purchased a new Navman 4600 that I bought based on its published specs. It looks fantastic in the boat but it CAN'T FIND ONE DECENT FISH IN THE ENTIRE MORETON BAY!! I spent over $1k, got the big screen (bigger than a drive-in according to Treasure) and it still can't find a decent fish.
In fairness, it has only been fitted for the last couple of weeks and it will get a proper work-out over the weekend. I'm going to try for a cod or a tailor (or anything suicidal) at Amity and around the Rainbow. I also fitted up the matching Navman 560 GPS and I am really impressed with it. It has the best daylight screen and the screen regenerates really fast, much better than the Furuno that I was previouly used to and about 25% of the cost. The final piece of the package is the Navman fuel transducer that interfaces with the GPS (to obtain distance and speed data) and reports fuel burn, economy and remaining fuel - a great product.