"magnetic distukbance, 75 



different from that determined in other places. This applies both to 

 corrected and uncorrected compasses, the change in a corrected com- 

 pass being- largely dependent on the suitability of the correctors, viz, 

 magnets or soft iron, and in an uncorrected compass on the suitability 

 of its position relative to the surrounding iron, especially vertical 

 iron. 



Local magnetic disturbance. — In many parts of Newfoundland 

 and Labrador local magnetic disturbances affect magnetic compasses 

 on shore. Although it is not possible that these disturbing forces can 

 extend to vessels navigating off the coasts, yet they may extend to 

 vessels at anchor near the shore and areas of disturbance may also 

 exist in places at the bottom of the sea capable of producing small 

 disturbances in compasses of vessels when in shallow Avater. Actual 

 experiences of this kind liaA'e occurred, but they are not common. In 

 water exceeding 50 fathoms in depth no effect has been observed. 



In view of these facts, the method of fixing position by sextant and 

 station pointer is preferable to the method by bearings. 



