The Lakemaster does have the advantage of having a water level offset that is not available with Navionics. This is very handy with lake levels that fluctuate a lot. If you ever upgrade to the I-pilot link, you will also have the follow the countour feature with Lakemaster.

Barring that, it is all about which one has better coverage for the lakes you fish....have to do some homework to figure that out.

Lakemaster is mapping a LOT of new lakes now.....might hold off for the 2014 edition if you have time.