There are plenty on the map. Are you saying there were even more not marked?
Can you tell now when the electric ones are on without getting zapped?
All the fences are on the Routegadget map, but none were on the actual competition map.
No way of telling in advance which ones are going to be electric - think it probably depends on the farmer. On this course the main electric ones were before and after control 3 - my route deviates in a couple of places to look for a safe way to get across.