If you line up on a north-south runway, what does the compass say? If it says 259, then the card is right. What do the other 11 headings on the card say? 23.1327 says the error can not be more than 10 degrees unless it is caused by electrical equipment. If it is more than 10 degrees you have to have a gyroscopic direction indicator. But if it really is 100 degrees off someone should spend some time on a compass rose.