Peter,Since I retired last year I've been working for West Marine (boat parts and supplies) part time, mostly for the employee discount. I'm going with Navico for all my electronics and purchased the B&G Zues2 chart plotter and the Simrad RS35 VHF/AIS radio and HS35 remote handset. I haven't purchased the transducer yet and don't have the exact dimensions, but it is the DST800 thru-hull triducer that has speed, depth and temp. I tried to find the size info on Navico's websites, but didn't locate anything. From the pictures it appears to be about 5" tall. I probably won't be ordering it for a few more weeks. If you're not in any hurry, I can send you the measurements once I receive it.Thanks for the idea of the aft quadrant. That would help keep the cable runs short. and easy to get to from a cockpit locker, as long as I don't pile a bunch of stuff all around it.Rics/v Blue Max#2692www.ric-maxfield.net