Guests at a remote Pelorus Sound lodge kayaked frantically across a bay to raise the alarm after their friend was injured on wet rocks.

The 51-year-old woman slipped and injured her arm or wrist while gathering mussels near Nydia Bay.

Nelson Marlborough Rescue Helicopter pilot Tim Douglas-Clifford airlifted the woman at 11.45am to Blenheim's Wairau Hospital.

"She was in a lot of pain, but conscious," Mr Douglas-Clifford said. Two friends kayaked one kilometre to alert staff at On The Track Lodge, where the woman had been staying.

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Lodge operator Tom Francis said the woman was stretchered to a DOC lodge from where the helicopter picked her up.

"She was very shaky and feeling nauseous and not very good at all, I'm pleased I didn't try get her back on the boat."

"She was meant to stay here for three days then this happened, such a shame. The sea was calm as a millpond."