Andrey, do you see the point in wearing speed boots?
From the manual:
4) Speedy - Pathfinding + Scouting
bonus: moves at a speed of (0.5*MaxS + 0.5*MinS, 0.75*MaxS + 0.25*MinS, MaxS), where MinS is the speed of the slowest unit, and MaxS is the speed of the fastest unit in the army. In simpler terms, there is no longer a need for "speeding up."
Why waste a slot on a navel for some dubious speed boost, which can be easily achieved with taverns/inns throughout the game?