The Lowrance Endura Sierra is the high-end model in the recently introduced Endura product line. It includes preloaded Accuterra™ “high-resolution” topo maps, a trails and POI database and NAVTEQ® roads for the 48 contiguous United States. Turn-by-turn routing is available as an add-on purchase. The Sierra includes a tri-axial electronic compass, barometric altimeter and 4 GB of internal memory. All three Endura models utilize a 2.7” color touchscreen.