Hi, I recently acquired a milspec NAV1000M, still works, unfortunately it doesn't have any of the accessories, just the unit, but it powers up on the six AA batteries no problem. Everything works! The special part about this one is that it is the FIRST one. That's right on the back it is serial # M0 001. I have no idea what it's worth, but would be willing to take offers, or if someone out there has an idea, I would appreciate an honest opinion as to its value. Thanks Tad