普通高中课程标准实验教科书 英语选修9 Unit 2 Using Language

　　Once we were at sea, our routine every day was the same. At sunrise and sunset the captain measured our position using the quadrant and set the course using the compass. It was extremely difficult for us to get a correct reading from the quadrant as the boat moved constantly. The captain used a system called "dead reckoning". He knew there was land directly northwest of our original position. So his task was to make sure we stayed on that course. As you can see from the map we kept to a straight course pretty well. In addition, the captain kept us all busy reading the tables to work out our position. Although this took a great deal of time, it didn't matter. Time was, after all, what we had a lot of!

　　Our daily food was shared equally among us all: one piece of bread and one cup of water. It was starvation quantities but the extreme lack of water was the hardest to cope with psychologically. Imagine all that water around you, but none of it was safe to drink because the salt in it would drive you mad! All the time the captain tried to preserve our good spirits by telling stories and talking hopefully about what we would do when we got back to England. We only half believed him.

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