I think for other lakes, it doesn’t matter. I think for the high def lakes, Lakemaster probably has Navionics beat. When I saw the LakeMaster map, I thought that the fishfinder had failed to connect to the map card, and I was seeing the base map which came with the fish finder, but it turns out that that’s what LakeMaster’s “Standard Definition Survey” of Flathead Lake looks like. LakeMaster's contour lines just follow the shoreline of the point. For example, at the northwest corner of Finley Point, the LakeMaster map doesn’t show the line of mounds up to 150 feet high which extends to the northwest from the point (from 200 feet up to 50 feet, and extending for about 3/4 of a mile, so they aren't a trivial underwater feature).

They look like a child was given a crayon and told to draw a couple of lines parallel to the lakeshore. I went fishing on Flathead Lake with a friend who had just bought the LakeMaster maps, and discovered that the standard definition maps of that lake are less than worthless. I do a lot of fishing on Flathead Lake, and Lakemaster only has a standard definition survey of that lake, which is junk. But if your favorite lakes aren't covered by one of the 11 HD Lakemaster maps, you'd be better off with the Navionics maps. From pictures I have seen of high definition LakeMaster maps, they appear to have comparable detail to the Navionics maps, so if you do most of your fishing on a lake which is covered by a high definition LakeMaster map, you may be OK on that lake. All the rest are standard definition surveys, which on the lakes where I fish are basically worthless. In Montana, there are only 11 lakes which have HD maps. Non-bold denotes standard definition surveys, bold denotes HD lakes, bold italic denotes HD LakeMaster surveyed lakes, and * denotes new or remapped lakes. However, before you review the list of lake maps available in Montana, check out the legend in the upper right corner of the first page of the list. There is a list of the lake maps available on the Lakemaster system at. You can check out the Navionics maps all over the country and off-shore on the Navionics web app at &key=yctzGh%7DfhT. Which lake maps are best for you may depend on which system has the best maps for the lakes where you fish the most.

Navionics plus lake list