By using the two books, the current location of the yacht can be determined. Reading the diary gives 2 pieces of information: the ship left Oswil on August 1st, and the current date is August 6th. On the poster next to the map it is written that Oswil is at coordinates (6,6). Following the boat heading log, it can be determined that on August 6th the boat's position is (3,3). Placing the pin there, use the radio to call for rescue.