First thoughts.. oh fudge - the one you've cited Imac...was my first choice... but it's the "FS" model, complete with transducer for $999 (and there's a $100 rebate from Lowrance) and that's attractive for a guy operating commercially... Appreciate the feedback - and I've already left a message for FMT's tech support.
One of the things about running day after day in all kinds of conditions (with all kinds of anglers....) is that I do try to anticipate all the bad things that can happen to gear when you have absolute beginners on board (and won't comment about all the stuff broken over the years for one reason or other...). 'Nuff said about that -but as a result I do try to keep my gear contained within the perimeter of my too small console... stuff lasts longer that way...
I'm fortunate that I really, really know the places I run routinely (and did learn most of it long before GPS became common...) but I am looking forward to working into new areas (and don't like running aground in places like the Loxahatchee at night with anglers aboard...). Most of what I know about Florida Bay is also very badly out of date (and was learned in a skiff that floated in only six inches of water - not like my Maverick) so in that regard I do need an up to date chartplotter... I've already been running a boat or two with chartplotter and FMT, so I do have some idea of what to expect. I'm also well aware that quite a few have little in-depth knowledge of their electronics - and how to get the best use from them... I'm a bit better than that - but will still need to get serious about learning all the ins and outs of my gear. Yes, I also know that a 12" is far superior to a 9" screen - but for my purposes it's just not on the menu..
Thanks to all who have responded and keep it coming. To give you some idea of my technical skills with electronics - my kids are my tech experts (and the grandkids are probably ahead of me as well) - but I'll figure it out eventually...