A loss that arises from the reasonable sacrifice at a time of peril of any part of a ship or its cargo for the purpose of preserving the ship and the remainder of its cargo together with any expenditure made for the same purpose.
An example of a general average loss would include jettisoning cargo to keep a ship afloat and an example of general average expenditure would include towing a stricken vessel into port.
An average adjuster calculates the value of each saved interest to each interested party which is then obliged to contribute towards the general average loss or expenditure proportionately. Subject to the terms of the policy, insurance will generally only apply if the loss was incurred to avoid or in connection with the avoidance of an insured peril.