Hi Jim and Melita, Yes, I was trying to create a custom coordinate system. I'm able to change the central meridian (180), but not the range (0 to 360, positive west). The coordinate system is based on SimpleCylindrical_Titan, with the following ranges and radii: CenterLongitude = 180.0 EquatorialRadius = 2575000.0 <meters> PolarRadius = 2575000.0 <meters> LongitudeDirection = PositiveWest LongitudeDomain = 360 MinimumLatitude = -90.0 MaximumLatitude = 90.0 MinimumLongitude = 0.0 MaximumLongitude = 360.0 Christine
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