average passage speed

My garmin gives time underway as well as time stopped and total time.

It works the average on time underway.

Donald
 
Easy to work on 6 kts, similar to what the trainee military pilots work on for ease of speed per distance. Also on our chart a very good guide is length of fag box is 1 hour.
 
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I use 4 knots to plan.

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I've got used to planning at 4.2 knots. Over a long passage the calms and headwinds cancel out the favourable winds, and 100 miles per day makes planning easy.
 
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