The high-frequency, broad-spectrum properties of the UWB (ultra-wide bandwidth) communications protocol enable very accurate, e.g., millimeter-level, spatial and directional localization of devices. The high-precision localization ability of UWB enables fine-grained interactions with devices, e.g., the ability to send commands to specific devices when multiple devices are present in a space. This disclosure describes techniques to bootstrap precise positioning on non-UWB devices, such that UWB-style, fine-grained interactions are enabled even on non-UWB devices. The techniques leverage the presence of two or more UWB-enabled devices, e.g., one on a stationary device and another on a wearable device (or other non-stationary device), to precisely locate non-UWB devices
