Humminbird Basemap is built off of data from LakeMaster, NOAA and other trusted sources. These accurate maps provide you with a clear view of underwater terrain and surrounding points of interest so you can fish and navigate with total confidence.The latest update contains general chart improvements and has been reformatted to work with the latest HELIX software update, version 2.280.Additionally, this Humminbird Basemap update provides the necessary software to support and operate Humminbird chartswith VX Technology, such as new CoastMaster – U.S. Coastal charts, on compatible models.