This map Includes lake Erie, lake St. Clair, lake Huron, western lake Ontario and parts of Georgian bay. Has excellent detail of bottom contour, wrecks, structure and landmarks. C-Map NT+ Code: M-NA-C105 This map is for a Raymarine unit. Not sure if it's compatible with others i.e. Navman, Navionics or Bottomline units. $150.00 OBO.