3. Letters regarding shipment are usually written for the following purposes (I )to confirm the charter party and booking note (2 )to urge an early shipment ()to amend shipping terms (4 )to give shipping advice (5 to dispatch shipping documents;3. Letters regarding shipment are usually written for the following purposes: (1)to confirm the charter party and booking note; (2)to urge an early shipment; (3)to amend shipping terms; (4)to give shipping advice; (5)to dispatch shipping documents;