If the magnetic North arrow in the declination diagram is to the left or north Gridline then what should the Compass reading be?

If the magnetic North arrow in the declination diagram is to the left of the north gridline, this indicates that magnetic North is west of true North. To obtain a compass reading that aligns with true North, you would need to add the declination angle to your compass reading. Therefore, if the magnetic North is to the left, the compass reading should be adjusted accordingly to the right (east) to compensate for the declination.