In SCS 900 I have a TTM loaded into a TSC3 datalogger. Under design, you can specify to display contours and display the contour interval; however, when you pick something that makes sense like 1' contours, it always comes bakc with something weird like "contour interval must be 2.7 or greater" Anyone know why this is? I was using it to try to check that the TTM version of the DTM created in Civil 3d was accurate.