Regional and local trains in Spain are very easy. Long-distance trains are another matter.There are phone-based applications about. Mobile Atlas Creator for example might be well worth checking out - as a way to download OpenCycleMaps etc to a phone/iPod. Something like a Garmin Hcx still has the huge advantage of using AA batteries and a relatively long battery life (although using a small screen is a pain). The other advantage is that digital maps weigh nothing (OK the equipment to use them does weigh a bit) and give you way more detail than you would get on the sort of scale map (eg 1:200k) that wis feasible to carry. They also cost nothing, or very little in comparison to paper maps. (I use both paper and digital maps BTW). I found having a GPS with detailed mapping invaluable when the road shown on my Michelin map turned out to be carsand motorbikes only, with a GPS I was able to find the backroads that weren't shown on the map.A Brittany coastal path? I don't know the coast from Roscoff going west, but SFAIK certainly going to Roscoff here's only a long-distance hiking path which is definitely not suitable for biking (and IIRC bikes aren't allowed on it).