I have a Lake HD V15 WEST mapping card. this is the big SD and also has the micro inside it.
I had it in my HDS 7. $100 shipped Look here at lowrance to see what it covers.
Lowrance said the site is only covering the V16 cards so if the info was on the V15 card it should be on the V16 card and then you can look at the lakes covered by the card. FYI. use your phone and find the county of the lake your looking for and it will be easier to find your lake as lowrance list them by counties.http://www.lowrance.com/en-US/Products/Cartography/Lake-Insight-HD-West-v16.aspx