1592954412000 1312632483000 term-105710 1616541575303 1312632608000 1616290565779 adlib fitz-online adlib-term-105710 ecba0d77-c7ec-3a2c-915e-ac0f1095395d 2 1 scope note Charts having lines that connect places of equal magnetic declination or variation. LG5 reference term-105705 adlib-term-105705 81cbcc62-6e3e-31cf-baa6-8d37b61a8e77 isogonic chart V.VW.AFU.AFU.AXC.CXA.AFU.ALO.AXC.BCW.AXC 1 code V.VW.AFU.AFU.AXC.CXA.AFU.ALO.AXC.BCW.AXC 1 isogonic charts reference term-105720 adlib-term-105720 ec384eb7-449d-3856-8e23-f555ee0f38b0 geological maps isogonic charts term