▁on ▁a ▁chart . ▁It ▁also ▁anal ys ed ▁other ▁sources ▁of ▁error , ▁including ▁the ▁risk ▁of ▁par alla x ▁errors ▁with ▁some ▁instruments ; ▁and ▁fault y ▁estimates ▁of ▁latitude ▁and ▁longitude ▁on ▁contemporary ▁charts . ▁ ▁In ▁ 1 5 9 9 / 1 6 0 0 , ▁Edward ▁Wright ' s ▁World ▁Chart ▁of ▁ 1 5 9 9 ▁was ▁the ▁first ▁map ▁under ▁the ▁Mer c ator ▁projection ▁drawn ▁by ▁an ▁English man ▁for ▁English ▁navigation . ▁The ▁map ▁prom in ently ▁displays ▁the ▁Queen ▁Elizabeth ▁I ▁Priv y ▁Se al ; ▁the ▁only ▁one ▁of ▁her ▁real m ▁to ▁carry ▁her ▁private ▁se al . ▁ ▁The ▁Mol y ne ux ▁ 1 5 9 2 ▁glo be ▁is ▁the ▁only ▁other ▁cart ography ▁with ▁her ▁Priv y ▁Se al . ▁Both ▁identify ▁" N ova ▁Alb ion ", ▁the ▁land ▁Captain ▁Francis ▁Dra ke ▁claimed ▁for ▁his ▁Queen ▁during ▁his ▁ 1 5 7 7 - 1 5 8 0 ▁circ umn avigation , ▁above ▁the ▁ 4 0 th ▁parallel . ▁ ▁In ▁ 1 6 3 1 , ▁Pierre ▁Vern ier ▁described ▁his ▁newly ▁invent ed ▁quadr ant ▁that ▁was ▁accurate ▁to ▁one ▁minute ▁of ▁arc . ▁ ▁In ▁theory , ▁this ▁level ▁of ▁accuracy ▁could ▁give ▁a ▁line ▁of ▁position ▁within ▁a ▁na ut ical ▁mile ▁of ▁the ▁navig ator ' s ▁actual ▁position . ▁ ▁In ▁ 1 6 3 5 , ▁Henry ▁G elli brand ▁published ▁an ▁account ▁of ▁year ly