I have a very basic question that will seem very elementary to most who observe this website. The reason I ask is because I have been told to difference answers and I'm now a little confused. So, here I go. Assume that Magnetic North is +14.62e & True North is +13.113e and Grid North is -1.49w. If I wanted to correct gyro surveys (in True North) and then converted them to Grid North, what values would be needed to do so correctly. I'been told to add 1.49 deg to the True North surveys which would convert them to Grid North. But, I've also been told the opposite and subtract the 1.49 deg from the True North. I've also been led to believe that since you are going from True to Grid (in a counterclock wise direction) you would therefore add the -1.49 deg. Perhaps someone can better explain.
Thanks in advance,