Which statement about geographic to grid conversion is NOT true?

• A. The coefficient p is positive if the point is located on the east of the Central Meridian.
• B. The sign of p does not affect the computed Northing of a point.
• C. The coefficient p is positive if the point is located on the west of the Central Meridian.
• D. All choices are true.

Answer: (C)

The key idea is how geographic to grid conversion handles direction relative to the Central Meridian. The term that involves the difference in longitude from the Central Meridian carries a sign: it’s positive for locations east of the meridian and negative for locations west. So the statement that this coefficient is positive to the west is not true—the opposite is correct.

Also, this sign affects the Easting part of the grid coordinates, which depends on longitude, while Northing is determined mainly by latitude and the meridional arc. The sign of the longitude-term coefficient does not change the Northing calculation.

So the not-true statement is the one claiming the coefficient is positive to the west of the Central Meridian.