Peaceable Projects Inc. is a U.S.-based non-profit group that brings the vast resources of the wide world together with the ongoing needs of the people who live, work, and travel on the Camino de Santiago pilgrim trail network in Spain.
2002 CF: 2004 from Paris: 2006 VF: 2007 CF: 2009 Aragones, Ingles, Finisterre: 2011 X 2 on CF: 2013 'Caracoles': 2014 CF and Ingles 'Caracoles":2015 Logrono-Burgos (Hospitalero San Anton): 2016 La Douay to Aosta/San Gimignano to Rome:
I think you read about the Ruta del Mar.
Unfortunately, a couple of years ago the Archdiocese decided that the forty nautical miles traversed through the Arousa sea and the Ulla river was no longer considered valid for the purposes of obtaining the Compostela upon reaching Santiago. The church decided that sailing over the Arousa was more of a touristic expedition than a pilgrimage
The Maritime Camino, "Ruta del Mar", is one of the oldest and the least known of all the routes followed by current pilgrims and those of yore. If you want to read about it, and see some beautiful pictures there of, go to http://www.caminoasantiago.com click on the British flag for the version in English. On the page that comes up there is a little map where all the Camino routes in Galicia are listed; on the third section underneath the map you will find the introduction to the Maritime Route from which you can go and read the entire writing about the route and see the pictures.