You ever tried using GPS up in the areas where rallys take place?
gps makes a connection with satellites high in the sky. so unless you're in a faraday cage,a rock tunnel, or a thick concrete building, getting gps signal shouldn't be a problem.
Don't think it's a surprise that both UK events are on Tarmac; I think the chances of an International series on Gravel in the UK is almost nil; which is sad. The various Forestry owners want far too...
Jon is far more knowledgeable than the majority here.......
WRC mainclass from 2027