Navigational Rallies, also know as TSD or Time Speed Distance Rallies, are navigational challenges where teams are given routes to follow and average speeds to maintain. While the speeds are below the posted limit the roads used are usually still a challenge for both the driver and navigator. TSD’s are often a gateway to performance rallying and the top level competition can be intense. Serious competitors will consider skid-plates, driving lights, rally computers (specific TSD computers are available), map lights and specialized tires. First aid kits, emergency triangles and fire extinguishers, although not required, are recommended.