Map of the Spirit rover traverse across the Gusev plains showing the location of large craters and their ejecta deposits and overlain on Mars Orbiter Camera (MOC) imagery. Traverse extends from the Columbia Memorial Station landing site to the rim of Bonneville crater and then past Missoula, Searles, Lahontan, and, finally, Tecopa craters before reaching the base of the Columbia Hills. Spirit has since traversed farther to the south and east to the vicinity of Home Plate.