Knowing the accuracy of your odometer and speedometer is very important to your success in TSD rallying as you try to push your scores down toward zero. One good place to calibrate is at an official speedometer check section. Be sure to check both your odometer and your speedometer as they will likely be off by different factors.
This is the list of speedometer check stations in the Washington State DOT Northwest Region (NWR). The NWR consists of King, Snohomish, Skagit, Whatcom, Island and San Juan Counties:
This information is current as of August 2005.