Explorer is one of the two rewards you can choose after you have upgraded a level 1 city to level 2 (the other being Workshop). It spawns an explorer who shows you some of the tiles around you. Every tile explored gives 5 points. These explorers can also be found in ruins. Sailing gives the Explorer the ability to move in water, and Navigation lets it move in oceans. Explorers change in color based on the tribe that used them.