The pattern is limited to relatively low current speeds, as the current will set the divers off their planned paths.
Boats are limited to speeds less than five miles per hour.
Most backhoes are limited to much lower speeds.
P drivers could even be limited to low speeds.
By comparison, current Wi-Fi technology is limited to several hundred feet and speeds of 11 megabits a second.
Some models had to be stopped to perform different tasks and were often limited to certain speeds, altitudes and attitudes.
The E.428 was to be built in conjunction with a lighter version, the E.326, but those proved unsuccessful and were limited to lower speeds.
With these design considerations and no afterburner, the F-117 is limited to subsonic speeds.
Only cooling problems might limit such machines to slower average speeds.
Other operators did not have this luxury and were generally limited to much lower speeds.