'St Mary's Church' : Church

TownlandHowth Castle
Grid RefO 278 392
Longitude6° 4' 44.05" W
Latitude53° 23' 14.98" N
ITM east480366
ITM north584435
Nearest TownMallahide (8.6 Km)
OS Sheet50
UTM zone29U
UTM x449041
UTM y5761192

This is a subsite of:

Howth - Lake or Island
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Visit Notes

Sunday, 13th January 2002

Right above the harbour at Howth this ruined church offers great views of the island of Ireland's Eye and the harbour itself. The first structure stood here in 1042, but the current ruins are some 300 years older.

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Like this monument

Marked Sites


Drive into Howth via the R105 from Dublin. You will reach a cross roads where the R106 goes north. Carry straight on until you reach Howth Harbour. If you look up and to the right you will see St Mary's.

Random Gazetteer

A Selection of Other Churches

About Coordinates Displayed

This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.

Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.

Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.

The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.

UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.

ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.

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