That is a very attractive map, I am not sure that some of the detail is entirely correct but far superior and more informative than the official versions.
A few points.
Stations Bayside to Howth should be flagged as having an infrequent service. All DART stations have an irregular service and often infrequent service later in the evening Mondays to Fridays and on Saturdays and Sundays.
There is car parking at Laytown, mostly Meath County Council which is free.