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simon3
2012-05-23 00:36:35
Map coordinates of Djouce.
The majority of maps in Ireland such as the OS/ LPS/ Harveys/ Healy etc use a system such that a place is represented in this style A 123 456. All GPS units and all books I have seen use the same style for representing the Irish Grid. The "A" represents one of 25 squares that cover the island each of 100km by 100km. The "123" represents the easting within that square or the distance from the left edge, in this case 12.3km The northing represents the distance from the bottom of the square, in this case 23.4km

So any point on the island can be represented to within 100m with just 7 characters. Djouce for example is O 178 103 (that is O for Oscar, followed by 6 numbers). For greater accuracy you can extend the number of digits in the easting and northing, so for example a more accurate position for Djouce is given on the website as O17858 10360, which represents a point to within 1 metre.

While East-West maps have a number of useful characteristics, regrettably they have chosen not to use this well established convention and instead of using the 100km squares mentioned before, use a distance from a point off the south west coast. The point is known as the "false origin". In that system Djouce's coordinates of 3178 2103 means 317.8km east of this point and 210.3 km north of it. You will note that the "178" and "103" are the same digits as appear in the conventional grid reference.

At least some of the East West maps do show the letters that the conventional system uses in a little inset towards the bottom left and you could, with some effort, figure out what the letter should be. (The letter is known as the myriad letter incidentally.) However you may find it easier to use one of the other types of maps to work with grid references and GPS units.

Another advantage of the other maps is that they show the eastings and northings on the grid lines at intervals across the sheet. This is advantageous because when the map is folded it makes it possible to work with grid references. For any East-West map I have been able to check this is not the case, which is extremely awkward. For example to go from a GPS reading on say a Garmin GPS you take the figure from the GPS which might be O17858 10360 and first remove the last two digits of the easting and northing which is easy enough but then you need to figure out what figure to put in front of the easting and northing based on the myriad letter, a process which of course is error prone. You then need to unfold the map completely to be able to see the easting and northing printed at the side of the map and only then can you figure out your position on the map.


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Track
Exploration of Wicklow Head from the north.
simon3 20 hours ago.
As you will immediately see from the track this was an exploration of what is possible thoroughly exploring various d... walk, Len: 6.6km, Climb: 126m, Area: Brides Hill, Wicklow Coastal Hill (Irelan

  
Summit Comment
Ballyguile Hill: Viewed from the south. Hope you like masts.
simon3 a day ago.
Ballyguile Hill can also be seen well from the south. Here's a view taken from near Brides Hill (a coastal hill near Wicklow Head)

  
Summit Comment
The Eagles Rock: A short but sweet scramble
IainT 2 days ago.
One of the few Irish summits that needs the use of hands by the easiest route. Those happy with exposure can get a good airy scramble (grade 2, pushing 3 maybe), by slanting left up an obvious ram...

Summit Comment
Slieve Foye: Irish Gabbro!
IainT 2 days ago.
Gabbro is one of the roughest and most frictiony rocks around and is superb for scrambling on, as all visitors to the Skye Cuiilin across the water know. I never realised until yesterday that Slie...

  
Track
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David-Guenot 2 days ago.
Ascending Catalogna's sacred mountain from the hamlet of Los Masos de Vallmanya, on well-marked trails, with two breaks walk, Len: 24.8km, Climb: 1853m, Area: France, Occitanie ()

  
Summit Comment
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IainT 2 days ago.
If you drive up the road this has to be a contender for the easiest summit in Ireland, but it's well worth doing for the superb view. Wicklow to Donegal, with the Meath lowlands spread out like a ...

Track
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wicklore 3 days ago.
A short walk on Ireland's Eye in September 2015. Original plan to visit earlier in the summer was thwarted by a huge f... walk, Len: 2.6km, Climb: 80m, Area: Ireland's Eye, Dublin Islands (Ireland) I

  
Summit Comment
Seanadh Bhéara: Access
sandman 3 days ago.
To answer the query raised by TommyV for at the time to facilitate parking on a narrow road and not wishing to park on the N59 i parked beside the farm yard with a view to access the hill via the ...

  
Forum: General
Windphone project destroyed
wicklore 3 days ago.
The Wind Phone art project in the Dublin Mountains has been destroyed http://jrnl.ie/3547797 . It appears to be a strong statement by those against the idea

Summit Comment
Ireland's Eye: Screams were heard, getting fainter and fainter…
wicklore 4 days ago.
Ireland's Eye is situated about 1.5kms north of Howth Harbour. In Celtic times it was called Eria’s Island and then Erin’s Island. The Norse called it Erin’s Ey and this became Ireland’s Eye. (Ey ...

  
Track
Pic de Cagire Loop
David-Guenot 4 days ago.
A great loop walk in one of my favourite areas in the Pyrenees, which should have hardly taken more than 4h30 hadn't I m walk, Len: 11.8km, Climb: 892m, Area: France, Occitanie ()

  
Summit Summary
Carhoo Hill: Dingle Eask Tower
Collaborative entry Last edit by: aidand 4 days ago.
This is a modest climb, but with wonderful views. Take the road out of Dingle towards Ventry. After about a mile turn left at a sign marked 'Hanlon's handbags'. There is a parking area with a hut ...


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