There is no con­di­tion of the ship or cargo for which the Gyro-Com­pass must be cor­rec­ted.

An American Clipper, highest type of sailing ships.

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.

Influences Due to Temperature Changes

Changes in the temp­er­a­ture of the stack, due to shift­ing of the wind and force of draft, vary its mag­net­ic char­ac­ter­ist­ics. Cons­e­quent­ly the Mag­netic Com­pass is af­fected.