See, even a Neanderthal can be trained...I know because it is only recently that I learned to walk upright myself..
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Personally, I am a gadget freak. But, over four Caminos, I LEARNED, evolved, and finally got it right, almost perfect in fact.
THEN on my fourth attempt this year, in April, my hips, knees and ankles all gave out...ironic...no?
So, I am regrouping, reevaluating, and reinventing a new method to do Camino in future. I will adapt and overcome!
You can find multi-USB splitters in most any mobile phone shop in Europe. But, once in Spain, look for "China Stores." The first one I encountered on my initial
Camino Frances was in Pamplona. But they are in most every large town or city along the Camino. In Sarria, there is a very large one across the street from the Caminoteca shop, at the base of the LONG stairs. If you've been there, or are there you will KNOW what I am referring to.
These shops are frequently named something like "Oriental Bazaar," "Asian Bazaar," or something similar. But they ALL are usually run by Chinese immigrants to Spain and contain everything imaginable, all made in China. But, many of the electronics are very inexpensive and suitable to purpose. I always find my 1 to 3 outlet splitters there, lightweight and usually for less than €2.
Also, you can find all sorts of USB cables and chargers there. However, I always advise sticking to proprietary chargers and cables (like Apple or Samsung), or sourced from known multi-national vendors, like: Belkin, Griffin, or Hama, etc. There are many reports of fried mobile devices and even fires caused by inexpensive chargers and cables. So, it is caveat emptor. I have written about this elsewhere on the forum.
FYI, there is a El Corte Ingles department store in Pamplona, near the bus station, that sells name-branded electronic accessories, including Apple. They also have a general electronics department for plug splitters.
Otherwise, the China Stores can provide an almost endless profusion of clever gadgets you never knew existed or could not live without. On my first trip, I bought a dozen micro-fleece tubes that could be worn as a neck protector, balaclava, or a watch cap to give away to pilgrims who needed better head protection. There was a very late winter in April 2013. They cost only €1,20 each at the time. It was a good investment, and good karma too.
I hope this helps.