This link will provide a focus for information, relating to NavPac, HMNAO's astro-navigation software package for the PC under the Microsoft Windows™ operating system. NavPac 3.1 has almanac data covering the period from 1986 to 2015. Information is also available on issues, updates and bug fixes.
Register your copy of the software by providing your e-mail address and serial number. Registration will allow HMNAO to advise you of updates and bug fixes to the software as and when they become available. You may also remove your registration.
Download a replacement executable file for the latest version of the NavPac software (only for customers with valid serial numbers).