In practice, this means that vertical lines are counted from the central meridian or 500 000 metre line, those to the left of it having an "easting" value of less than 500 000 metres, and those on the right having a value above that. Actually, zones never attain the full width of 1 000 000 metres which such a measurement suggests in fact, in northern Canada, zone widths shrink to as little as 80 000 metres (40 000 metres on either side of the central meridian). Vertical lines are measured from a separate point for each zone, namely, an imaginary line lying 500 000 metres west of the zone's central meridian. Because Canada's southernmost point is about 4 620 000 metres from the equator, all horizontal lines in Canada have a "northing" value above that figure. On the Civilian UTM Grid Reference System, horizontal lines are designated by their distance from the equator in metres. Two systems are marked on NTS maps for identifying points with reference to the rectangular grid: Civilian UTM Grid Reference System described below and Military Grid Reference System.
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