It is nice having an accurate odometer. The speedometer can easily be ignored for a GPS program on a phone such as waze.Just to clarify, the speedo-healer used to electronically correct the speedometer is recommended but not required when going with the SSSYE. It is also an additional item you need to purchase - not included with the SSSYE. I have good intentions of eventually getting around to purchasing one but haven't spent the money yet. For the time being, I rely on other methods for monitoring my speed.