What coordinates system is this please?

**Neil** · 29th April 2015, 07:32 AM

Sorry, i get a different Stand. UTC conversion for those lat/lon coordinates:

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Did you use Clarke 1866 as datum? BTW, NATO UTM uses a different format as explained earlier. Your coords are Standard UTM

**mamamouchi** · 29th April 2015, 10:03 AM

Yep, I did use the Clark 1866 datum.
I think there is a problem somewhere...Blue Cathedral is the only point I know for sure.
I will try to repair my GPS to see what unit/system is it.

yes, I know it does not correspond at the stand UTM that I have for this point...strange

**Neil** · 29th April 2015, 11:20 AM

Blue Cathedral Entry Point coords are given as N9°31.244 E123°41.076 by this site:

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That's good enough 9.520722 123.684611 or 9°31'14.6" 123°41'04.6" and is placed by Google Maps as about 50-70m to the immediate north of Balicasag Island: [Only registered and activated users can see links. ]. How come there's a problem, the lat/lon doesn't match with your data? The problem it seems is not with the conversions to Standard UTM therefore. The conversion on U of WIS site with Clarke 1866 datum i get is Easting 575139.3 Northing 1052496.8 Zone 51. i.e. to nearest whole figures:
51575139E
1052497N

**mamamouchi** · 29th April 2015, 02:16 PM

This is not the same cathedral. Blue Cathedral is in Siargao, Cathedral is in Bohol.
My problem is that I have my list of points with apparently Standard UTM coord.
and I can not translate it to another system to see where are those points.
When I do it with Blue Cathderal ( it is the only point I have that I know exactly the location) I can compare UTM that I have and normal coord on google earth). And it does not match!

all points of the list looks to be at the same location.

**tli** · 29th April 2015, 02:29 PM

@mamamouchi, I only recognized the format, but I actually know very little about this, so sorry I couldn't be of more help. It might help Neil and others to know which specific make and model number of your GPS unit that had created your list of way-points? Good luck.

**catymag** · 29th April 2015, 03:02 PM

Originally Posted by mamamouchi

This is not the same cathedral. Blue Cathedral is in Siargao, Cathedral is in Bohol.

This one?

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May be you can contact some diving center and ask for help

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**mamamouchi** · 30th April 2015, 02:57 AM

Thank you guys, but the problem is not Blue Cathedral!
I know exactly where it is, and what is the exact location! (I am the only dive center here!

)
Blue Cathedral is good to work with (in order to find out what coord it is) , because I have both: UTM and normal coord.

But I have a list of old dive sites, with old names. I would like to localisate them.
and all sites have the same format.
But when I want to convert the UTM to normal, it does not fit...and Blue Cathedral is a good example.
arghhhh, not easy...
and I can not post a photo...it does not work

**Neil** · 30th April 2015, 03:17 AM

@mamamouchi
Very preoccupied with 'cathedral' naming in Philippines it seems. Just to complicate life, there's also a tiny island 'Blue Cathedral' off Siargao at approx 9.844899 126.157463 about 1.5km NW of the dive site Blue Cathedral at 9.834645 126.167505:

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I'm so sorry, like tli i have no idea how to help you further. Caty's advice is good i think and you should contact other local dive shops/operators to check coords of the questionable sites. I recall dimly there's a problem using Standard UTM conversion outside continental NA as i said at first. This is something to do with a particular and area-specific equation used in converting there which is not usable for the rest of the world, however i thought the likely error was more that of a few [or at worse several] hundred metres, not many kilometres as you're finding.

Here's another thing: When i convert the UTM coords [52174139E;1077749N] as you're supplied in P#9 to lat/long it places Blue Cathedral dive site at 9.736867 126.030315 and surprise, surprise! You'll never guess where that is:

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Yep, pretty-much right back where we started from at what you thought was a dive site ~200m directly to the east of the point of East Bacus Grande. Maybe you've accidentally mixed things up somewhere.

Thread: What coordinates system is this please?

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