Together with Sarah outer, Justine paddled much of the chain of Aleutian Islands and then followed the Alaskan coastline.
The pair were aiming for a road from where Sarah could continue her journey on bike. She's circumnavigating the globe entirely by human power.
Justine will be telling her story with photos and video at the Scottish Canoe Association big paddling show in Perth later this month.
This year it's called An Fheis Mhor, Scotland's Festival of Paddlesport and runs 24-26th October.
Here Justine tell the tale of the expedition at SeaKayakPodcasts.com, or on iTunes or listen to the streaming version below.