Walleyez,
The Lakemaster Wisconsin chip I use on my Humminbird 898 has been awesome. It has 1 foot contours of the flowage and has been very accurate, showing me an awful lot of structure that I didn't realize was there, after 20 years of driving around. You can highlight the shallow areas, raise and lower the lake levels shown for the contours based on the conditions, and clearly see the river channel while boating around. You still need to be very careful...but it has been a good investment. Not all of the shallow rock bars are necessarily there, or perfect, but so far so good. You will probably take the Hot Spots map and put in a drawer somewhere and never look at it again. Just double check that the chip you buy has the TFF in HD.

Rocko