One complements the other. GPS mostly offers 'quantitative' data like speed, location and deceleration. Cameras can tell you what happened, but without context. With both, first you need to know where and when to look.

How's My Driving offers 'qualitative' information on judgement-based issues like 'courtesy', 'giving way' and other good driving habits. Reported incidents featuring factors like these tend to be the real measures of how risky a driver's on-road behaviour is. You also get reports of compliments, giviing you a balanced perspective of performance and training needs.

In summary, not only does How's My Driving enhance the value of new technology, the technology enhances the value of How's My Driving.