stallfail, don't worry about opinions here. I read your posts and thanks for the info. I appreciate what evryone has to say and I can then pick out info which I need or dont need.
Roger Greendeck, I see thanks for the info. Any idea on maintenance costs for a GNS 430W? Whats involved in the maintanence of these GPS's?
And, why is it occasionally that aircraft are fitted with 2 identical GPS units?