Backofbeyond - thanks for the call out! Classic Speed would certainly solve the issue discussion. You are correct; we designed this product originally for the classic car market, but have found other markets - like motorcycles - that benefit from having an accurate speedometer regardless of the vehicle specifics.

We can't say for sure if it would satisfy MOT requirements as we have not researched these, but would welcome the expert(s) to weigh-in.

As for tunnels and tall buildings: yes, tunnels do cause a drop of satellite lock, however we designed an algorithm to keep a speed in the instance of lock loss. This keeps the recent average speed (last few seconds) displayed on the speedometer through the tunnel / parking structure. If you stop in the tunnel, the speed will slowly drop to zero as the average pulls in the zero speed. Tall buildings have yet to be an issue due to the powered external antenna we use. The issue with tall buildings is they limit the field of view of the sky, thus limiting the number of satellites to lock on. Our GPS hardware tracks 22 satellites on 66 channels simultaneously. Short story - about 10x better than your smart phone! We also use "dead reckoning" to fill in the blanks if needed. This is a basic navigating skill taught to sailors, Boy Scouts, and hikers.

I hope this helps!
---
Brian Induni, CEO & Classic Speed inventor
Classic Automotive Innovations