magnetic variation chart磁偏差海图;磁经偏差图
magnetic c chart地磁图
total magnetic intensity chart总磁强图
marine magnetic chart[海洋] 海洋磁力图
earth magnetic chart地磁图
Chart magnetic地磁图
chart dipole magnetic field赤道偶极子磁场
Magnetic Double-Sided Tabletop Pocket Chart磁性双面台式口袋图表