Kirsti - there are a couple of different methods of achieving that idea you had about the ports. Scroll down to see 'em all.

First idea: mouse over the ports in the map and some info pops up. Problem here is the ports are a little close together and may be a little confusing for visitors.

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Second idea. Select a port to see more information. Not as 'visual' but perhaps easier to navigate?

Exporting from Tokyo Port
Exporting from Yokohama Port
Exporting from Nagoya Port

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Third idea. Select a port from the drop down menu. Not as 'visual' but perhaps easier to navigate?

Choose a destination port... Auckland Tauranga Some other port

We can arrange import from Tokyo, Yokohama and Nagoya for delivery in Auckland.

We can arrange import from Tokyo, Yokohama and Nagoya for delivery in Tauranga.

We can arrange import from Tokyo, Yokohama and Nagoya for delivery in Some other port.