Magnetic Variation Out-of-Date

This download corrects an error that will appear when starting The CAPN when the Magnetic Variation file is out-of-date. This update is compatble with all versions of The CAPN.

How To Install

Please follow these instructions:

  1. Download the updated WMM.dat file by left clicking this link: WMM.dat
  2. Copy or Move this file (wmm.dat) into the CAPN folder "C:\Capn Voyager"
  3. Save the new WMM.dat file over the old WMM.dat file.  Be sure to click to overwrite the existing file.
  4. This will eliminate the warning message "Magnetic Variation is out of date".

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Contacting Technical Support

First browse our website to get the answers you need. If you cannot find them, we suggest sending an email to

Support is available to registered users of versions 8.3 and newer from 10 AM to 4 PM EST/EDT, Monday through Friday.

CAPN Software LLC
Fax: 703.759.3266


Product Registration

To register your product follow the link below and complete the product registration form, you will receive an email with The CAPN registration code confirming your registration.

Product Registration Form

CAPN Software LLC // Fax: 703.759.3266