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E. Maintenance 



The DPG system should receive standard marine maintenance 

 as due for an instrument of its type. Diver inspection should be 

 made at least semi-annually with copper scour pad change-out at 

 the beginning and end of the heavy fouling season. Special 

 attention should be given to the chain binders to ensure that they 

 are securing the anchor chains tautly. It is recommended that the 

 instrument be removed from the water and thoroughly inspected 

 after a period of four years at which time it should be re-coated 

 with anti-fouling paints. The buoy line should be replaced 

 annually before the heavy seas of winter. 



Note: To ensure satisfactory DPG operation with the software as 



written, it is essential that the instrument be re-assembled in 



precisely the same configuration as its original state of 

 deployment . 



