During the track-keeping control, the relativity between the current ship position and the set track must be confirmed.

在进行航迹控制时，必须确定当前船位与设定航迹的相对关系。

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GPS is the most important navigation and position equipment for its ability to provide the continuous and precise ship position.

而在船舶导航设备中，GPS以其能提供连续、高精度的船位，已经成为船上最重要的一种导航和定位的方法。

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As an automatic decision-making assistance system, it can decide ship position relative to the continent, mark target position, assist navigation, and avoid the danger.

作为一个自动决策辅助系统，能连续确定船舶相对于大陆的位置、标定目标的位置，辅助导航和避险。

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The two became friends. John Henslow suggested that Charles Darwin take the unpaid position of naturalist for a trip on the British ship H.M.S.Beagle.

VOA: special.2009.02.25

A navigator would take the last known position of the ship, then add the ship's speed.

VOA: special.2009.12.23

When bad weather prevented navigators from seeing the sun,moon or stars, they had to use a method called "dead reckoning" to find the ship's position.

VOA: special.2009.12.23

Linked to GPS devices and sonar positioning beacons on the seafloor, the thrusters can keep the ship in a steady position even in 95mph winds.

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The weak signal can cause a ship's instruments to gradually drift out of true, without setting off any alarms, leaving the ship in a different position to where it "thinks" it is.

BBC: Navigational backup to aid ships in Dover straits

The ship cannot stay in its current position, as it represents a danger for the environment, he added.

CNN: Wrecked Costa Concordia to be raised from Italian sea bed