The Velodyssey website has gps downloads (as well as the option of making your own) here
https://www.cycling-lavelodyssee.com/practical-info/the-gps-tracklog
That website used to be fantastic! But they have upgraded it..... cue French joke here.
With all respect to
@jay clock I wouldn't see a need for toting a computer for navigation on this route. It's pretty well signposted (not perfect!) and there are no shortage of tourist info offices (when they're open) to pick up local maps along the way. But if that's your thing and it gets you on the road then do it!
No matter what solution you decide to follow, it's a good idea to get some practise at home first on familiar roads. Test things like battery life, what happens when you go off route, what's it like in the rain/sun etc.
Out of necessity, I developed the theory that while I may not know where I am I am not lost!
Feeling lost only arises when I have to be a certain place for a certain time - and I have no idea how to get there. So, I simply reduce those situations as much as possible. Carrying a tent means that I can always find a place to sleep. An emergency stash of food means that I won't starve.
A long trip like you are planning is only long in the planning. The day to day of getting up and moving on to somewhere new, finding food, drink and a place to rest is incredibly simple and therapeutic. The miles look after themselves.
I like to stop and appreciate the places I find along the way. They may not be famous, or the top tourist places, but they are places that speak to me on some level. They are very rarely the places I might pick out in advance.
One thing to bear in mind on a long trip is the amount of time alone. Some people are fine with that and never feel lonely, while for others the loneliness can be brutal. Even a few words of the local lingo can open doors and the most important bit of kit to pack is a big smile - it will open most doors.
If you like to read, a kindle is a great bit of kit. Carry all the books you want with minimal weight.
If I may.... perhaps something to consider is stretching your journey to include the Camino de Santiago?
Traditionally a religious pilgrimage, although nowadays, it is less religious, but could be described as "Spiritual".
Basically, thousands of people crossing different routes in Spain, all converging on Santiago de Compostela, mainly on foot, but also doable on a bike. Wonderful people to be met, interesting accommodations, the opportunity to share a journey with strangers all carrying their own burdens. Best of all, almost impossible to get lost!
I did it after the Velodyssey and enjoyed the experience. I don't view it as a bike tour, but a very interesting experience. For me, the value was not in the religion or the spirituality, but in the Humanity. All is there to see and experience. Some good, some not so good. And history! So much history!
Best of luck on your tour!
