The units were interrelated. Units of one measure, such as length, increased by powers of ten (millimeters, centimeters, decimeters, meters). A liter was the volume of a cube 10 centimeters on a side.
If sold by area, as with fabric or sod, use square inches, square feet, square yards, square centimeters, square decimeters or square centimeters. And if the product is sold by count, the unit is ...
In most cases, the real-time kinetic receivers on the bicyclists and pedestrians achieve RTK-fixed, or RTK-float accuracy, resulting in errors on the order of a few centimeters, or a few decimeters, ...