To use the map with a Lowrance GPSr, download the file, unzip it, and copy all of the .lcm files over to your SD card (may be in the root directory or another directory where map files are stored). Lowrance GPSrs without SD cards are not supported.

With the stock settings, the map will probably look pretty cluttered on your GPS screen. What you can do is turn off the labels for the trails and roads and that will help. The trails are considered US Highways and/or State Highways, so for those turn off the symbols. The roads are considered "Roads - Rural" so find those in the menu and turn off the symbols and labels for them too.

It's a little different for each unit, but here are two examples: