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used for fishing
50 to 200 tons
cheap
fast

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A simple videos to let you guys know how to use a magnetic compass. Please Subscribe and for more videos on tech and other information follow me on Twitter : https://twitter.com/swarnim_mandal Instagram : https://www.instagram.com/swarnim_mandal23/?hl=en Facebook : https://www.facebook.com/swarnim.mandal . . . . Please Subscribe

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 magnetize your self to a magnetic compass

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 magnetize your self to a magnetic compass

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1. always pointed north
2. showed 8 directions
3. showed what way they were going
4. it help with maps too

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The simplest form of an echo sounder is a lead line, 60 feet long, attached to a 1 to 1,5 kilogram lead weight. In the base of the weight is a cavity used for taking sea bed samples, which are useful when piloting or anchoring. The line has a series of marks along its length.

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1. This helps sailors find depth
2. helped sailors get samples of  the sea floor
3. it also let them know what they were sailing over
4. it help for anchoring