Sorry but this is not a direct answer to your post. I have a 14ft skiff that I fish mostly bay and local waters with. It currently has a Hummingbird x100(I think thats the model). Anyway it's a good little unit. I recetnly upgarded to larger unit. I would be interested in selling the Hummingbird pretty cheap. Let me know if your interested.

Regards,
Don

dondadda87 at yahoo.com