Originally Posted by
Not Long Here
It has always struck me as quite strange that mil-standard GPS isn't acceptable for civil PBN certification. I know that they don't normally come with TSO 145/146 but when you actually delve into performance/FDE etc the Mil GPS installed in most military aircraft easily meet the requirements. Certification through equivalence?
Lack of RAIM prediction and electing, or SBAS (which omits the RAIM prediction requirement) as part of the MGPS milspec is an issue.