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Showing content with the highest reputation on 03/11/2019 in all areas

  1. 1 point
    Velocity and speed are not the same things. Velocity has a direction component and speed does not. Lots of engineering students have gone off track by confusing the two terms. Therefore VMG means speed made good in a specific direction, which can be upwind, downwind or crosswise. Neither SMG nor CMG are as well defined although CMG can be so defined if you wish.
  2. 1 point
    Interesting how you guys refer to it as VMG instead of what most Mariners at least on the west coast refer to it as SMG (speed made good) or CMG (course made good). As a licensed deck officer and 23 years as a Coast Guard rescue boat operator I had never heard of VMG. Anyways thank you for your explanation. After looking the term up on google search it is a sailing yacht term to describe upwind sailing as you guys previously stated, which might be why I wasn't familiar with the term, even though I'm no stranger to sailing either. Learn something every day!
  3. 1 point
    Technically you are correct. Unfortunately, on modern (at least on two my Garmin) GPS if you pick a waypoint and then select VMG it gives you the speed to the mark with no regard to wind direction. Ironically, most of my testing has been to an upwind mark when beating, but it's also useful downwind.
  4. 1 point
    Yes, VMG means velocity made good, but good as in towards the wind. VMC or velocity made course is the rate at which you are approaching your destination. And closely related, and significant in giving meaning to the other terms is TWA, towards wind angle. For any given boat their is an optimum TWA for getting the highest VMG possible. This is the angle you use sailing to weather.

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