I was deputed to Japan for the scientific expedition. I boarded in the ship from Japan and worked in japn sea and signoff from the ship in Japan and then back to India. During the ship stay I was provided the boarding and lodging free. My office calculated the DA for the Japan ( land Stay period, before and after ship) as USD 100, but during the ship stay it is calculated as 25% of the Indian DA. It is not calculated as 25% of Japan DA ( USD 100). what will be the actual DA ? it must be 25% of USD 100 ?. Or any special DA is applicable in Ship stay?.