I have Humminbirds on my boat and use both the Lakemaster and the Navionics. They both are good and have different applications. The Lakemaster only works in the Birds but the Navionics works equally well in both Birds and Lowrance. I like the lake offset and water highlite that the Lakemaster provides but think Navionics show some detail like roadbeds and foundations that the Lakemaster doesn't show. Check them both out online and see which you may like most. Lakemaster is more limited on the lakes than the Navionics.