Welcome to the Humminbird Side Imaging Forums proskeeterman.
The main differences would be the lakes covered and the detail that they are covered in plus the additional features that only work with LakeMaster mapping cards:
Water Level Offset
Shallow Water Highlight
i-Pilot Link – follow the contour
Thanks Greg. Just got a email about the new Strikemaster card. Is this an addition to the Lakemaster, or an upgrade? Guess what I am asking is this, do you have to already have a Lakemaster card before you get the Strikemaster card?
Strike Master is a separate series of mapping cards+ from LakeMaster. These have maps on them plus the added information for the Strike Master functions to work. The Strike Master mapping cards are only usable in the ONIX and ION series of Humminbird units.