Deck : General Navigation - 233/2138
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| You are downbound approaching a lock and see 3 green lights in a vertical line. This indicates __________. |
| A) that you should hold up until the signal changes to 2 green lights |
| B) that the lock chamber is open and ready to receive your tow |
| C) the upstream end of the land wall |
| D) the upstream end of the river wall |
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