Just go to www.osi.ie , under the map is a green tap that says "explore maps using our free viewer" click on it. Then bookmark that page that it take you to. and play around with it. If you left click on a spot it zooms-in. if you right click you will notice the icon will change to a minis sign and you can zoom-out, if you right click again, it will change to a hand and you can drag the map around to where ever you want, and one more right click will take you back to the plus sign to zoom-in again. If this is bookmarked on your phone or laptop you could use this for a map when you are traveling.