GPS speed


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  1. #1
    Prolific Poster RGV250's Avatar
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    Default GPS speed

    Hi,
    I am having my first dabble at GPS, the bit I really want is the speed over ground.
    Everything is working fine but I have noticed that speed over ground (KPH) is in $GPVTG which is optional, speed in knots is available in $GPRMC. Is there any difference, I would have to do maths on KPH to get MPH anyway so is there any reason why I should try to get the speed over ground value out of $GPVTG and convert it when I already have speed in Knots?.

    Bobby

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  3. #2
    Maverick
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    No reason I can think of ,, just conver knots to mph

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    david
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    Hi,
    Stick with the knots to save yourself processing another string.
    Knots x 23/20 should work or for better precision use 84/73.

    Why mph? I thought only the US and some small African nation were the only non-metric outposts remaining.

    Cheers,
    David

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    Prolific Poster RGV250's Avatar
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    Hi David,
    It's 'cos we invented this driving lark, I see at least you are still following the rules we laid down and drive on the correct side of the road.

    I did not really want to start writing to the GPS module if I did not have to in case I screwed it up, at the moment it has gone well.

    Thanks,
    Bobby

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    Fanatical Contributor fanie's Avatar
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    I was just wondering why Mav was still bothered by the mph.

    1kn = 1.852km/hr. It's about time the US let go of these pre-historic measurements and switch to metric. It's more accurate anyway
    Fanie

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    davidhousley
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    The Knot is an SI unit!!! And so is the nautical mile. The metre used to be defined as a fraction of the nautical mile.

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