Hello photoman,
Actually, as far as I am aware, BINGO requires Cartesian (Euclidean), right handed system. Geographic systems are not Cartesian, since they include curvature of the Earth.
If my information is outdated, can you please provide a reference to the manual or an article that states that BINGO support geographic coordinates of input. Also have you got any recent experience working with geographic/projected coordinates in BINGO?