For clarification. Depths returned from the sdi reader are converted to meters. The Northing/Easting values are in an unknown projection (i.e they could be in meters or feet). There is nothing in the sdi binary file that can tell you whether the units are meters or feet. In practice the units for Northing/Easting (and hence distance along profile) will be the same as that of the lake boundary shapefile that hydropick is importing elsewhere. Also, as a practice our Hydrosurvey group pretty much uses one of the 5 Texas stateplane coordinate systems and always use feet.