I have lake insight on my HDS-5 and Insight on my HDS-7, along with a 2008 Navionics Premium chip. The chip shows 1' contour lines and channels, seems to be very acurate on the channels. I have found a lot of humps and ridges using the chip that aren't there on the pre-loaded maps. In my opinion the chip is better than the pre-loaded maps. I have heard that the 2008 was better than the 2009 or 2010, but I haven't seen one to do a comparision with.

-LP