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Posted by ps56k on April 29, 2010, 12:58 am


as I learned in another thread - MGRS -
http://www.armystudyguide.com/content/Prep_For_Basic_Training/Prep_for_basic_land_navigation/locate-a-point-using-the-.shtml

So, is the MGRS the same exact thing as UTM ?
since UTM came about to help the military....


--
----------------------------------
"If everything seems to be going well,
you have obviously overlooked something." - Steven Wright



Posted by pmh on April 29, 2010, 9:02 am


wrote:
> as I learned in another thread - MGRS -http://www.armystudyguide.com/cont=
ent/Prep_For_Basic_Training/Prep_fo...
> So, is the MGRS the same exact thing as UTM ?
> since UTM came about to help the military....
> --
> ----------------------------------
> "If everything seems to be going well,
> you have obviously overlooked something." - Steven Wright

Based on my understanding of the link you provided, I would say they
are the same system.

PMH

Posted by Sebastian on April 29, 2010, 10:16 am


To make it easy, MGRS is using UTM to point out a certain location but
tries to do it faster. The difference is that UTM doesn't cover up the
world i squares but bands.

UTM - divides the world in bands, then you find your location in that
band. Eg. 12N 612243 543212 (12th band, northern hemisphere, then
coordinate).

MGRS - divides the bands into squares, then divides the squares into
smaller squares of 10 000m and name these after letters. Eg.
5VRN1234567890 (Big square 5V, small square RN, coordinate easting
12345 northing 67890). Often you don'n need to send square information
and rarely big square information so this saves times. Normally you
don't care about meter precision eather so a quick coordinate sent
could look like 123 456 and that gives you a location with 100m
precision. Most important, it can never get confused. Number (1-2)
and one letter means big square, two letters means small, only numbers
the 10 000m square and it's length defines the precision.

UTM can use the big squares to btw. Iv'e seen 10 000m squares used to
but then with numbers instead of letters. The many systems that call
them self UTM is why this often gets confused. It's really any system
that use the method of dividing the earth into 60 bands. I always
prefer MGRS since it's well defined and the best system for my usage
out there.

//Sebastian

Posted by Sebastian on April 29, 2010, 10:50 am


> To make it easy, MGRS is using UTM to point out a certain location but
> tries to do it faster. The difference is that UTM doesn't cover up the
> world i squares but bands.
> UTM - divides the world in bands, then you find your location in that
> band. Eg. 12N 612243 543212 (12th band, northern hemisphere, then
> coordinate).
> MGRS - divides the bands into squares, then divides the squares into
> smaller squares of 10 000m and name these after letters. Eg.
> 5VRN1234567890 (Big square 5V, small square RN, coordinate easting
> 12345 northing 67890). Often you don'n need to send square information
> and rarely big square information so this saves times. Normally you
> don't care about meter precision eather so a quick coordinate sent
> could look like 123 456 and that gives you a location with 100m
> precision. =A0Most important, it can never get confused. Number (1-2)
> and one letter means big square, two letters means small, only numbers
> the 10 000m square and it's length defines the precision.
> UTM can use the big squares to btw. Iv'e seen 10 000m squares used to
> but then with numbers instead of letters. The many systems that call
> them self UTM is why this often gets confused. It's really any system
> that use the method of dividing the earth into 60 bands. I always
> prefer MGRS since it's well defined and the best system for my usage
> out there.
> //Sebastian

I'm stupid at times... not 10 000m of coarse, 100 000m it is.

Posted by ps56k on April 29, 2010, 11:13 pm



> To make it easy, MGRS is using UTM to point out a certain location but
> tries to do it faster. The difference is that UTM doesn't cover up the
> world i squares but bands.
> UTM - divides the world in bands, then you find your location in that
> band. Eg. 12N 612243 543212 (12th band, northern hemisphere, then
> coordinate).
> MGRS - divides the bands into squares, then divides the squares into
> smaller squares of 10 000m and name these after letters. Eg.
> 5VRN1234567890 (Big square 5V, small square RN, coordinate easting
> 12345 northing 67890). Often you don'n need to send square information
> and rarely big square information so this saves times. Normally you
> don't care about meter precision eather so a quick coordinate sent
> could look like 123 456 and that gives you a location with 100m
> precision. Most important, it can never get confused. Number (1-2)
> and one letter means big square, two letters means small, only numbers
> the 10 000m square and it's length defines the precision.
> UTM can use the big squares to btw. Iv'e seen 10 000m squares used to
> but then with numbers instead of letters. The many systems that call
> them self UTM is why this often gets confused. It's really any system
> that use the method of dividing the earth into 60 bands. I always
> prefer MGRS since it's well defined and the best system for my usage
> out there.
> //Sebastian

interesting...
had just learned about UTM a few years ago
along with reading BackPacking Magazine listing locations using UTM.

Just took my old Garmin GPS 12 outside, took a sat lock,
looked at the coords using the normal lat/lon,
and then switched to UTM and then MGRS.

I liked the MGRS coord from UTM -
taking the first 2 digits and transforming them into letters,
but keeping the remaining UTM digits exactly the same.