Something like this,
classic style Bicycle Speedometer? Or
Beacon Cyclometer? I'm more familiar with wired cycle computers like Avocet, Cateye, and Sigma; and wireless varieties like Garmin and IpBike with an Android phone. In principle, they all work the same by counting the number of wheel rotations and multiplying by the wheel's circumference to derive the speed and distance traveled. I believe the older variants, vintage, don't allow one to define the wheel circumference. You still could get dropped data, but nothing as bad as GPS satellites/phone towers. The accuracy will be as good as the measurement of the wheel circumference and far more accurate than GPS from a phone or a handheld (unless that's a survey-grade device).