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Typically, if you are out in the open ocean and do not have a GPS device you don't have any useful way to measure velocity* This may not be a problem though, as what you are wanting is not your ve...
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#1: Attribution notice removed
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System
·
2020-05-27T11:08:40Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/1964 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/