This area comprises a yachting marina (one of the main centres for sailing in the Firth of Clyde), the P&O ferry port to Northern Ireland, and it is also used for fishing. It makes an interesting place to visit if you're in the town. I had a stroll around there the other day to take these photos.
The harbour has been in use since the 17th century. It was then greatly enlarged and improved in 1812 when the railway was installed. Pity the poor horses that pulled the coal wagons along the rails from Kilmarnock to Troon!
Sailors will find around 300 moorings here, plenty of marina facilities, with electricity and water on the pontoons; showers, toilets and laundry facilities nearby. You can buy fuel including calor gas. There are many other services offered and this (rather expensive in my opinion) restaurant alongside the marina. (My husband and I went back to eat at our favourite Bradfords in the town centre - by far the best value for money!)