The general great lakes map might not have very good countours, not sure witch one they are sending but the one I looked at didn't have any in deeper water. Do a search fo na-054 high res or give jepsen a call.
I installed the svs650 with the airmar P66 this spring. So far I am happy with it but It's too soon for me to recomend it over the furuno. I haven't used the furuno but the furuno does seem to have more advanced features. The screen size/resoulotion on the Sitex is great but the auto settings don't seem to work well at all so it needs to be in manual and adjusted regularly for best preformance. If you prefer to set it up and leave it alone the sitex is not for you.
I would be happy to PM my phone # if you have any specific questions.
Hope this helps
Paul
Hi Jeff
I used one of these clipped on my cannon balls:
http://www.fish307.com/vexilardeptherm.aspx
This is not a substitute for a speed & temp probe but it helps until you are ready to invest in a probe.
Paul
Hi Guys
The Whitby tournament this weekend is going to be a lot of fun.
Good guys there, a BBQ after and great prizes if you get lucky.
If you can make it you will learn a lot form them.
Paul