▁chart ing ▁battle ▁plans ▁and ▁taking ▁top ographic ▁measurements ▁used ▁in ▁later ▁maps . ▁ ▁Sum mon ed ▁from ▁Son ora ▁by ▁New ▁Spain ' s ▁visit ador ▁( ins pect or ▁general ) ▁José ▁de ▁G ál vez , ▁Cost ans ó ▁tra ve led ▁south ▁to ▁San ▁Bl as ▁in ▁ 1 7 6 8 ▁for ▁a ▁meeting ▁to ▁plan ▁the ▁up coming ▁Spanish ▁land ▁and ▁sea ▁exped itions ▁to ▁Al ta ▁California . ▁A im ing ▁to ▁develop ▁San ▁Bl as ▁as ▁a ▁permanent ▁settlement ▁and ▁supply ▁base ▁for ▁the ▁chain ▁of ▁Spanish ▁pres id ios ▁and ▁Catholic ▁miss ions ▁project ed ▁for ▁Al ta ▁California , ▁G ál vez ▁assigned ▁Cost ans ó ▁to ▁complete ▁a ▁set ▁of ▁maps ▁and ▁draw ings ▁of ▁San ▁Bl as , ▁for ▁submission ▁to ▁vic ero y ▁Carlos ▁Francisco ▁de ▁Cro ix ▁in ▁Mexico ▁City . ▁ ▁G ál vez ▁and ▁Cost ans ó ▁then ▁sa iled ▁across ▁the ▁Sea ▁of ▁Cort és ▁to ▁B aja ▁California , ▁landing ▁in ▁rund own ▁mission ▁fields ▁vac ated ▁by ▁recently ▁exp elled ▁Jes uit ▁pri ests . ▁G ál vez ▁sent ▁Cost ans ó ▁to ▁the ▁area ▁north ▁of ▁Cab o ▁( cape ) ▁San ▁Lucas , ▁where ▁he ▁made ▁scale ▁draw ings ▁and ▁plans ▁of ▁the ▁c ape , ▁Bah ía ▁( bay ) ▁de ▁La ▁Paz , ▁and ▁Is la ▁Cer ral vo . ▁ ▁Vo y age ▁from ▁B aja ▁California ▁to ▁San ▁Diego ▁Jo ining ▁the ▁expedition ▁head ed ▁by ▁Gas