4th Entry, 1536 Hours: By now, the Mechanical Advantage team have completed their project, and the Celestial Tracking team have also done the lion's share of their work, with the sun's zenith having come and gone. The Salinity team is still hard at it, though. As we approach the Battery, Maarten collects another water sample. The Salinity team will continue collecting data right up to our anchorage in Haverstraw Bay on Day Five.