![]() Refer to Figure 1.) but Edition 4 of the same map was based on "North American Datum 1983" or "NAD 83". Edition 3 of our map was based on "North American Datum 1927" or "NAD 27" (shown as the Datum Note in the bottom margin of topo maps. We were using two editions of the same map. Was there a misprint on the maps?Ĭanoe trippers should be aware of what has happened. The maps appeared the same but the grid lines had shifted by over 200 metres. When looking at two maps we realized the grids on our Canadian 1:50 000 topographic sheets were not in the same positions. On a trip in the Algoma District our group was trying to identify exactly where we were on a long shoreline using triangulation and comparing our grid references. ![]() This article originally appeared in the May 1999 edition of "Canews", (the Magazine of the Ontario Recreational Canoeing Association).
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