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Calculating TTW with velocity or boat speed?

Forum - Electronic Navigation and Communications - Calculating TTW with velocity or boat speed?
Module Content - Sea Talks1
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Student
mark newell
Seattle, WA, USA
Skipper Level II
Status: Sailor
Qualified days: 28
Calculating TTW with velocity or boat speed?
Posted 2024, May 02 03:55
Appreciating the difference between boat speed and velocity, I'm wondering is 'velocity' is the correct word in the following paragraph about TTW. Since DTW includes an implied direction, "straight line", would "boat speed" be the correct input for determining TTW? "In this case, your sailing distance will be much longer than your DTW. Thus you can not always calculate the time to your destination by simply dividing your DTW by your velocity. Some units...." Feedback very appreciated.
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Grant Headifen
Reply 2024, May 02 11:37
Boat speedos typically reserved for speed through the water. Which can be different than speed over ground (SOG) In the statement velocity is referring to SOG
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Student
mark newell
Seattle, WA, USA
Skipper Level II
Status: Sailor
Qualified days: 28
Reply 2024, May 02 16:08
Got it, thank you for helping me see that. SOG is a vector and thus measure of velocity.
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