3.7" ? at Macaulay Plain, Esquimalt, Victoria, BC 1943

[maple_leaf_eh]

By coincidence I was working on a lesson plan about Mapping and Charting Establishment's 110 yrs of history. One point was that mappers in Canada had surveyed 59 coastal defence artillery positions during the war. They were quite proud they had 2' contour lines around the batteries. The rule of thumb is that the horizontal accuracy of a map is 1/2 the contour interval.