This past week, I took delivery of a Halda Speedpilot Mk. V that has a display suitable for rallies that are defined by kilometers. I am pleased to add this unit to my on-hand supply of rally navigation equipment. I now have Speedpilots that are applicable for both miles and kilometers depending upon the rally/driver needs for a rally where I might be asked to be a navigator.
Speedpilots: Left For Miles, Right For Kilometers
Halda Speedpilots were used from the 1950s to the 1970s by many rally navigators to help keep rally cars on time. Simply put, the left dial sets the required average speed and the right dial provides information about how the car is doing with respect to maintaining that average speed.
As the electronic era came along, the Halda Speedpilots were replaced by rally computers, but the Halda Speedpilots are still useful in many rally situations, especially in classic car rally events, depending upon the restrictions in the type of rally navigation equipment that can be used.