GSL Slip Renters and Marina Users. The Bathymetric maps of Great Salt Lake are now available for sale at the Marina Gift Store. The bathymetric maps are the ones that show the contour of the lake bottom. We have both the north arm and the south arm available for sale. Dave Dave Shearer Harbor Master Great Salt Lake State Marina Antelope Island State Marina 801-209-9142 The content of this message does not constitute official information from the State of Utah