Scouting is one of the. It increases hero's scouting radius by one at basic level, by two at advanced level and by three at expert level.
Scouting and high scouting radius is useful early in the game to reveal undiscovered lands. This can give a player an useful edge. However, scouting becomes useless at the end of the game when the most important areas are already mapped. This is the reason scouting is most useful for secondary skill for scout-type secondary heroes, and best combined with other traveling skills (logistics, pathfinding and navigation. Additionally, it is advantageous with scouting artifacts speculum and spyglass.