Slide the scale to the right,
keeping the bottom of the
scale on the bottom grid line
until Point A is under the
vertical (right-hand) scale.
To determine the six-digit
coordinate, the 100 meter
mark on the bottom scale,
which is nearest ther vertical
grid line, is the third digit of
the number 255. The 100-
meter mark on the vertical
scale, which is nearest Point
A, is the sixth digit of the
number 797. Putting these
together, you have 255797.