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  1. #1
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    Default What coordinates system is this please?

    Hello everybody,
    I need to find what is this system of coordinate.
    i did record some gps points with a unit that I do not know...and my gps is dead!
    it looks like this:
    52174148E
    1077749N
    This point is in Philippines, on Siargao Island, close to Dapa city.
    Do you know which unit/system of coordinates it is please?
    Thank you

    mama

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  3. #2
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    Hi and welcome to GPSpower.net.

    You asked this same question more than 2 years ago in another forum. Still no conclusive answer?

  4. #3
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    Quote Originally Posted by mamamouchi View Post
    Hello everybody,
    I need to find what is this system of coordinate.
    i did record some gps points with a unit that I do not know...and my gps is dead!
    it looks like this:
    52174148E
    1077749N
    This point is in Philippines, on Siargao Island, close to Dapa city.
    Do you know which unit/system of coordinates it is please?
    Thank you

    mama
    UTM Coordinates -
    Northing (Y): 1077749
    Easting (X): 174148
    Zone/Sector: 52N

    Equivalent to: N9.73687 E126.0304

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  5. #4
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    @mamamouchi
    As a side note, it's not possible to convert standard UTM grid references without knowing in which of the 60 possible earth zones they're contained as well as whether N or S of the Equator. In the above case it's given by tli correctly as 52N, which can be deduced from the other information you've supplied: "Philippines, on Siargao Island, close to Dapa city". In fact when converted from UTM to Lat/Lon to 4 decimal places as 9.7367 126.0304 as shown and near enough 944'12.7"N 12601'49.4"E, that point is in fact not all that close to Dapa City nor on Siargao Isl but about 2 or 3 kilometres roughly SW and in open sea, somewhat to the east of the northern-most point of Bacus Grande.

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    I've forgotten more about that type of conversion than i can remember, but i think really such UTM conversions are only quite accurate for continental North Americas and NATO UTM is better used for Lat/Lon of the rest of the world. The NATO version has alpha codes as zones of Latitude compensating somewhat of the distortion when extrapolating the spherical data of the earth to a two dimensional rectangular representation, rather than simply N or S of the equator as does the standard version.

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  6. #5
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    Question is, if the position is in WGS84 datum, becasuse Philippine reference system is PRS92, which has the different ellipsoid (Clarke 1866 see [Only registered and activated users can see links. ]) and the different location of the ellipsoid (see [Only registered and activated users can see links. ]). In this case the conversion from UTM to lat/lon using WGS4 is not correct.

  7. #6
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    Hi Smokefree, yes you are right.
    i still did not find it! ...ok I did stop look for it, but I really need it now.
    I just see the answers, I am on it...try to unsderstand it...my english is not so good.
    thanx everybody

  8. #7
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    Hi Neil,
    Thank you! Yes, this point is a diving spot, so it is in the water, sure...and it looks to be at the good location.
    I will check and confirm with my other points...but first I try to undersatnd how you did it...I am on it!

  9. #8
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    Datum is Clarke 1866 as said by zhrd, this is the conversion, full page:

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  10. #9
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    Hi Neil, Hi tli
    Thank you again.
    The first point looks good, because it is a dive site there.
    But I am trying with other points, and it does not work:
    per exemple, there is a famous dive site here, called Blue Cathedral. I know exactly where it is. (lat 9.834645, long 126.167505 on google earth)
    The info that I have is this:
    52174139E
    1077749N
    If I convert it with [Only registered and activated users can see links. ]
    , it does not match.

    same with other points that I have. Is it standard UTM or NATO UTM please?

  11. #10
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    Thank you also ZHRD, sorry I did not see your post!
    I am still very confuse, and I do not know how to localisate my points with this coordonates.
    All my points are like this...

 

 
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