one meter
100 meters
If I remember correctly, six digits.
The military standard is 1000x1000 meters, also known as a click.
210
10
300
1000
Depends in what unit you express it. In meters, a light-year is 9.5 x 1015 meters - that's a 16-digit number.
The answer depends on the grid.
Counting squares whose sides are along the grid-lines, there are 154.
1.North Grid 2.North - East Grid 3.South Grid 4.West Grid
One. 3.7 m means anything in the interval [3.65, 3.75). So the digit in the tenths place could be 6.