August 21st, 2011 – DAY 3 – Today, I learned how to add track layers into ArcGIS mapping software. I added several ROPOS dive tracks from the first leg of the cruise into the mapping software. ROPOS tracks at 5 Hz so there were hundreds of thousands of entries to upload which proved to be an issue with older excel documents which could keep track of about 64 thousand. A simple switch from excel files to csv files solved the problem though. ROPOS started dive 1465 to survey the RSN cable this afternoon which was amazing to watch. It descended to 1000m before the ship received updated track information on where the RSN cable actually was so we steamed for a couple hours at half a knot to where the cable was and ROPOS descended the rest of the way.