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Northern Ladoga area on maps

date country that compiled the map accuracy on a scale of 10 Tohma Heliulia Aniala Mullukulia Sortavala Lahdenkulia Karmala
after 1721 RUS 8,5 * + + - + + *
1792 RUS 6,5 * + - - + + -
1840 SWE 9 * + + + + + -
1900 FIN 10 + + + + + + +
1939 FIN 10 + + + + + + +
1614 RUS 6 - - - - + - -
1648 SWE 8 * + + - + - +
after 1656 NED 8 + - - - + - -
after 1725 NED 8 - - - - + - -
174* RUS 5 + x x - - - +
1745 RUS 6 + - - - + - +
1772 RUS 6 x - - - + - -
1789 RUS 5 * - - - + - -
1825 RUS 8,5 * - - - + - -
1856 GER 9 + - - - + - -
Legend: + - marked; - - not marked; * - marked but not signed; x - marked incorrectly;
RUS - Russia; SWE - Sweden; NED - the Netherlands; GER - Germany; FIN - Finland