25) What is the magnetic declination? If the magnetic and true bearing of a line are 322 Degree 30 Minutes and 319 Degree 30 Minutes?

26) Which declination direction is to be used for the - sign in true bearing line?

27) Which declination direction is to be used for the + sign in magnetic bearing line?

28) Which declination direction is to be used for the - sign in magnetic bearing line?

29) Which variations occurred by magnetic storms?