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A handy rule of thumb that we learned was "Red. Right. Returning." Which means, keep red markers on your right side when returning from sea. The upstream direction is the same as returning from sea. A lateral marker that is both red and green can be passed on either side but have a preferred channel indicated by whichever color is on top. We then learned about nun buoys, can buoys and day marks- Nun buoys are always red, can buoys are always green, and day marks are either red triangles or green squares. Again, the rule still applies: Red. Right. Returning.

User Zeynep
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Final answer:

Paddling a canoe upstream is easier near the shores where the current is weaker, while canoeing downstream is more efficient in the middle where the current is stronger.

Step-by-step explanation:

When paddling a canoe upstream, it is advised to stay close to the shore because the current is weaker near the edges of a river. This is caused by friction between the water and the riverbed as well as the riverbanks, which slows down the flow. Conversely, when canoeing downstream, the middle of the river is usually the deepest part, resulting in a swifter current that can make the trip easier and faster. The central flow can carry the canoe more effectively, allowing for better maneuverability and less paddling effort.

User Mwag
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