Nope. No FMS in the E-2. We can put points into the INS system, but if they tell you "cleared direct RYNOL" or such, unless you have pre-programmed it, you have to define it to the system.
Some planes have a COTS Garmin GNS-530, maybe about half of the planes at the RAG. Can't speak to fleet squadrons, but I think it's similar.
I just threw the HSI comment in there because I thought it was odd that we only have a T-34 style CDI in there. The "Glass Cockpit" upgrades the CODs are getting now is NICE, and I look forward to the far future when the E-2Cs get the retrofit.
I guess we're spoiled. From what I know of the Rhino system, if you don't have it programmed into your mission card, it's all L/L based, so we may be the only TACAIR nav system with simple direct capes. Our EGI "bricks" can hold almost all of the DAFIF information for CONUS, so you can just type in any three, four or five letter identifier and be on your way, to include any locally generated points such as "1355B" for VR points, etc. Certainly makes it easier when center throws a STAR at you.
Brett