With compasses
and using the latitude scale draw arcs of 41NM from SHA and 30NM from
CRK. If the aircraft is heading West and the ranges are decreasing
it must be at the easterly intersection of these two arcs: 52º15’N 008º05’W.
At the Easterly intersection which CAN be
plotted on the chart and at the given coordinates, on a heading of 270 the DME
distances would be decreasing (as the aircraft is flying into the plotted
circles).