The Program in Maritime Studies has several hand-held GPS units that can be used for position-fixing and recording the spatial location of artifacts or sites. The primary unit used in our fieldwork is the Garmin Rino 655t. This GPS uses pre-loaded topographic maps along with a high-sensitivity receiver to connect to the network of satellites and determine the position of the user in various geographical projections. The Maritime Heritage at Risk team uses the GPS to plot the spatial coordinates of the site itself, artifacts around a site, and to determine the extent of a site in conjunction with remote sensing methods like metal detection or GPR.