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Navico-Corus: VMG asymmetry

Discussion in 'Boat Electronics' started by Ulrich G. Kliegis, Oct 10, 2008.

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  1. Folks,
    Has anyone else observed this:
    The Navico Corus instruments can compute VMG when a log sensor and the
    masthead unit (wind direction and speed) are available.

    Now, the wind direction sensor needed a corrective offset on my boat,
    although mounted very straight. The manual says that this is normal,
    and under all other conditions, the readings look alright. Other than
    the computed VMG. On one bow, I get phantastic values, coming close to
    90% of vtw when beating close-hauled, on the other bow, this breaks
    down to a meager 20% or so.

    Did the guys (i know that the old Navico company was dissolved some
    years ago) forget to include the offset in the VMG computation?

    Thanks for any enlighting information.

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