To update THE CAPN software with the latest, 2025 NOAA World Magnetic Model (good through 2030):

1. Download & Save WMM.dat file to your computer.
2. Copy and paste the file into C:/Capn Voyager directory.
3. Accept the replacement of the WMM.dat file.
4. TIP: You can make back-up of the old WMM.dat file before doing steps 1-3 just in case.