You have numerous options, but ths easiest is likely simply to use an editor that allows you to set the coordinates of a node (JOSM, vespucci, http://wiki.openstreetmap.org/wiki/Level0, others?). The hackish solution is to simply center the map on the coordinates and add the node there, as in http://www.openstreetmap.org/#map=19/59.6582207/9.6543459 Somehow I suspect that using Level0 is the easiest for a one off.

You have numerous options, but ths easiest is likely simply to use an editor that allows you to set the coordinates of a node (JOSM, vespucci, http://wiki.openstreetmap.org/wiki/Level0, others?). THe The hackish solution is to simply center the map on the coordinates and add the node there, as in http://www.openstreetmap.org/#map=19/59.6582207/9.6543459 Somehow I suspect that using Level0 is the easiest for a one off.

You have numerous options, but ths easiest is likely simply to use an editor that allows you to set the coordinates of a node (JOSM, vespucci, http://wiki.openstreetmap.org/wiki/Level0, others?). THe hackish solution is to simply center the map on the coordinates and add the node there, as in http://www.openstreetmap.org/#map=19/59.6582207/9.6543459 Somehow I suspect that using Level0 is the easiest for a one off.