Passengers on the Interislander's Kaitaki ferry have welcomed the services of the country's first floating i-SITE visitor centre.

The satellite i-SITE opened on Monday, with an estimated 300 customers on the first day.

New Zealand's 90th i-SITE gives 400,000 travellers per year the opportunity to make accommodation and activity bookings and seek expert advice while crossing the Cook Strait on Interislander's largest ferry.

Positively Wellington Tourism Chief Executive David Perks joined the i-SITE team on board for their first sailing. Visitor feedback on day one was positive and sales had been well above target, he says.

"What's pivotal for us is that there were a number of passengers who, after talking to our staff, booked accommodation and stayed in Wellington when they had initially been planning to jump in a rental car and hit the road. The one gap we had in spreading Wellington's story to visitors was that vital time when people are actually entering the city; we've now plugged that gap."

Destination Marlborough General Manager Tracy Johnston says the organisation is thrilled with the early indications that passengers are using their time on board to choose and book Marlborough experiences and accommodation.

"With this new service we can now encourage arriving passengers to spend quality time in the region before they continue their South Island journey."

Thomas Davis, General Manager for Interislander, says: "We are delighted to see the opening today of such an innovative tourism initiative. One of the great ferry journeys in the world is, on early indications, inspiring our passengers to talk to i-SITE staff on board about all the other activities they can enjoy."

The Kaitaki i-SITE is being run as a partnership between Positively Wellington Tourism and Destination Marlborough and hosted by Interislander. The centre is being managed out of Wellington and is open on the ship daily from 7.45am-4.35pm.