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Posted by KBH on November 21, 2006, 12:57 pm


> The subject has gone into discussion of MGRS and USNG.
> The problem with MGRS and USNG is that they require an algorithmic
> conversion from UTM rather than an arithmetic conversion from UTM. Also,
> beginning with a point converted from UTM it is possible to define another
> point relative to the first point as being in the same longitudinal zone
> while it is actually in the next longitudinal zone. Then a third point a
> few meters East of the second point can actually be in the same
> longitudinal zone as the first point. So this second problem shows that
> MGRS is a draftsman's layout rather than a computation.

Actually, I meant there is a problem with USNG in certain areas of
latitudinal zone boundaries. The KBH Grid Reference does not rely on
latitudinal zones but simply counts from the equator...with letter
designations.

> And so the USNG derived from MGRS is another example of politicians
> dropping commandments from the sky and ignoring efficiencies and
> fundamentals.
> Here is a link to the KBH Grid Reference that is a simple arithmetic
> conversion from UTM:
> http://www.kbhscape.com/gr.htm
> But note the example of a one-hundred meter square...
>


Posted by Paul Hirose on November 28, 2006, 2:38 pm


I wrote:
> Most of the time the search teams are reporting their positions to
> the command post in UTM. For example, "0436629 by 3796711".
> I'm puzzled by the leading zero on easting. Isn't the largest
> possible easting less than 1000 km? If that's true, then the leading
> zero is a do-nothing digit. It will never be anything but zero. Yet,
> on radio I almost always hear UTM given that way.

A private message I received suggests this may be a Garmin thing. Can
anyone verify that? My Magellans (which are not any of the current
models) don't have the leading zero. I don't own any Garmin receivers.

The possible UTM eastings range from about 166 000 m to 834 000 m, so
I see no reason for a leading zero.

--
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Posted by Harald Hanche-Olsen on November 28, 2006, 3:44 pm



|> I'm puzzled by the leading zero on easting. Isn't the largest
|> possible easting less than 1000 km? If that's true, then the leading
|> zero is a do-nothing digit. It will never be anything but zero. Yet,
|> on radio I almost always hear UTM given that way.
|
| A private message I received suggests this may be a Garmin
| thing. Can anyone verify that?

Sure, my GPSmap 60 cx displays the leading zero on the easting.

| The possible UTM eastings range from about 166 000 m to 834 000 m, so
| I see no reason for a leading zero.

It could be that they figured it looks neat and orderly, with the
easting directly above the northing and both shown with the same
number of digits:

32 V 0570007
7031327

(best viewed in a fixed-width font). But I suppose the following
would work just as well.

32 V 570007
7031327

--
* Harald Hanche-Olsen <URL:http://www.math.ntnu.no/~hanche/>
- It is undesirable to believe a proposition
when there is no ground whatsoever for supposing it is true.
-- Bertrand Russell

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