1. Harbor bus 903 from Nyhavn to Operaen
2. A harbor bus coming in to Holmen North
3. Bus stop for harbor buses at Operaen
Like the Mouettes in Geneva, Switzerland, the Copenhagen Harbor Buses are boats which run on regular routes and can be used with the same ticket that you would use for a normal bus or a Metro train.
There are currently three Harbor Bus lines, numbered 901, 902 and 903 with a total of six stops, three on each side of the harbor.
Like the normal buses, the Harbor Buses are run by Movia, the Greater Copenhagen Transit Authority.
After the opera performance I attended at Operaen there were two Harbor Buses waiting to carry opera goers back across the harbor to the city center. Unfortunately there were more people waiting than would fit on the two boats, so some of the people had to wait for a third boat to arrive a few minutes later.
For a short 30 minute watery view of the sights around the main harbour or if you've had enough of walking try catching the waterbus which makes it way along the main parts of the harbour on a very regular and frequent schedule.
We stepped on board at the stop nearest the Little Mermaid and after criss-crossing the harbour we were up past Nyhavn in no time at all.
The conductor on the ferry asked us if we wanted to buy a day ticket for all public transport services in the city so clearly these tickets are interchangeable on the harbour bus with the other forms of public transport operating in Copenhagen.
Like all great harbour cities, Copenhagen has a harbour shuttle (Havnebus) bringing you to Nyhavn amongst other places. It is also very good for going from Nyhavn and the city centre to the new Opera on its island. Your ordinary public transport tickets are valid on the boats and you will recognise them by their yellow and black colours.
Harbor Bus rides are included in the general transportation pass that you receive with the Copenhagen Card. I think it's a great idea - though I'm not sure how much it actually meets the practical needs of transportation within the city.
A cheap way of getting around in Copenhagen is to buy a buscard /klippekort for DKK 115 (about €12). With this card you can make ten journeys in Copenhagen with bus or the yellow boats (a budget alternative to the expensive tourist boats operated by DFDS Seaways) which i would consider a tourist trap.
The public transport system of Copenhagen includes a boat service called Harbour Bus (Havnebussen). Since 2000 it serves a route between Nodre Toldbod in the north and the Royal Library (Det Kongelige Bibliotek) in the south. The trip takes about 20 minutes and can be paid with a normal public transport ticket.
We got one from near the Mermaid into town. or 2 I think. Great views of Copenhagen not seen from land. They finish early evening so rock the boat as early as possible.