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Pardon my ignoranc.. by march-fixer   (Show all posts)
Thanks for you cle.. by dewsbury   (Show all posts)
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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RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>
Track
Experimental track of a trip to Keeper Hill and 2 nearby summits.
simon3 15 hours ago.
This may not be at all an optimum route. walk, Length:20.8km, Climb: 859m, Area: Knockfune, Shannon (Ireland) Knockfune, Knockane, Keeper Hill

  
Forum: General
Thank you MV
ahendroff 17 hours ago.
At 5.42pm today I completed my 404th and final Arderin. Long journey to here. Delighted & overjoyed. Humbled at the challenge also. And thanks Mountain Views for that. Gougane Barra will always be...

  
Summit Comment
Soarns Hill: Forested summit
slemish a day ago.
Getting to the summit of Soarns Hill is difficult and the extensive forestry means that views are severely limited. But as it qualifies under MV prominence rules, off I went to climb it. I parked ...

Track
Varied, strenuous wild Bluestacks walk.
simon3 2 days ago.
This varied route explores the two Ardnageers, Croaghbane, C walk, Length:21.0km, Climb: 999m, Area: Ardnageer SW Top, Bluestack Mountains (Ireland)

  
Summit Comment
Soarns Hill: Local summit visit
Harry Goodman a day ago.
Climbed Soarns Hill to-day as one of the 100 listed hills nearest to my home. I used three5four0's very helpful route description. The following additional information may be useful. The second...

  
Forum: Suggestions
Re Main Area Display, logging
simon3 2 days ago.
The suggestion is that the list of summits for a mountain area obtained by asking for More Detail for the mountain area show whether or not the summit has been climbed. This has now been implement...

Forum: General
...
BleckCra a day ago.
Thank you kevin carroll. If I can put a smile on that contrary face, the Matterhorn should be a cakewalk.

  
Track
A circuit of the eastern Knockmeal hills
mcrtchly 3 days ago.
Park at S112081 and walk north along the road for about 170m walk, Length:11.7km, Climb: 620m, Area: Crohan West, Knockmealdown Mountains (Ireland) C

  
Summit Summary
Meenanea: Bump on ridge with good views.
Collaborative entry Last edit by: simon3 2 days ago.
Meenanea is a summit of low prominence on the ridge from Cronamuck to Croaghbarnes. It is most likely that it will be reached as part of a traverse along this ridge. It has excellent views towa...

Track
Walks Around Port 2
gerrym 4 days ago.
http://youtu.be/jq7O1tarPuQ A second walk starting and fini walk, Length:17.0km, Climb: 578m, Area: Donegal SW (Ireland)

  
Summit Summary
Cronamuck: Granite knob at the end of a ridge.
Collaborative entry Last edit by: simon3 2 days ago.
This summit can be reached using the ridge extending NE from Croaghbarnes and there are suggestions it could be reached from Commeen to the north on the R253. Cronamuck has views over towards Gau...

  
Forum: General
A Cloon Horseshoe "mini Scavvy"?
Conor74 a day ago.
Think none of the Scavvies so far have tackled the Dunkerrons, and the Cloon Horseshoe at its heart - Mullaghanattin, Beann, Finnararagh and then moving all the way on to Knocknagantee and swingin...


RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>