'The Great Bailey' : Promontory Fort

Grid RefO 295 367
Longitude6° 3' 15.8" W
Latitude53° 21' 52.67" N
ITM east480366
ITM north584435
Nearest TownMallahide (11.6 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

Don't let the name deceive you, there is noting here! The only thing on offer is the nearby lighthouse and stunning views of the Irish Sea.

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Marked Sites


Take the R105 from Dublin to Howth and when you reach the junction with the R106 turn right and drive almost to the other side of the island. Take the third right and park near to where a lane leads to the lighthouse. Walk down the lane marked 'private' towards the lighthouse and about 100m before you reach it climb up onto the bank to your left. That's where this place used to be.

Random Gazetteer

A Selection of Other Promontory Forts

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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