Well after looking up as much as possible regarding the LTN-101E I can only see reference to "sole means of navigation with GPS accuracy". Typical double speak so just what is happening here that is unique to this design has escaped me? I suspect that the GPS is an integral part of the IRU technology and unlike the Honeywell product line which typically uses a data port, the Litton system has it integrated into the IRS???
Thanks for the reference!