Older Inmarsat C systems like the Trimble Galaxy Inmarsat C, that can be bought used from E-Bay and other sources, are designed to be run on DOS and need special software to run on windows systems.
This software, developed by Jim Corenman(developer of winmail SSB mail), can be purchased from airmail2000.com
Nebula is not freeware, and requires registration in order to be fully functional. Without registration, the download operates in a demo mode with Galaxy communications disabled. Demo passwords are available for a limited period via email (the address is in the Help/About window). The cost to register the program is US$50, payable by check to "Sirius Cybernetics" at the address in Help/About window, or by credit card via Fax: the area code is 360 and the number is 378-4392. Address the fax to "Sirius Cybernetics", include the usual credit card details and both your Inmarsat Mobile# (9 digits starting with a "4") and the 10-digit Inmarsat Serial# (on a label on top of the Galaxy box).
Howard [ Just Imagine ] 13-Mar-2008