Influences Due to Cargo

Change in the char­acter or dis­pos­i­tion of the cargo of the ship causes a change in the mag­net­ic fields sur­round­ing the com­pass. These changes must be com­pen­sat­ed for.

The Sper­ry Gy­ro-Com­pass is not af­fect­ed by any cargo. A cargo of iron ore has no more ef­fect upon it than a cargo of cot­ton. You could even carry a load of strong mag­nets with­out caus­ing the slight­est dev­i­a­tion.