Just a prototype, no casing yet.

during an Airsoft match, it would be helpfull if you could find out where your teammates are relative to you.

A chest-worn unit that shows every teammate's distance and direction relative to where you are looking, for teams of up to 12 players, without GPS or a phone network.

every device is a meant to be standalone, and pairable as a group/team, so more than 1 team can be active at all times.

Goal and how it works

Each player sees on a small screen (arm display or smartwatch) where their teammates are: distance in metres and an arrow relative to the direction they face. Only your own team is shown; the other team's units are invisible to you.

The measurement uses three things:

Distance UWB twoway: two units exchange short ultrawideband radio pulses and time the round trip. The timing gives the distance to roughly 10 cm.

Direction PDoA, phase difference of arrival: the UWB module has two antennas a few centimetres apart. The tiny difference in arrival phase between them gives the angle the signal came from, in front of the unit.

Heading compass: a 9-axis motion sensor knows which way the unit faces. Combining it with the angle turns "30° to my left" into a bearing every teammate can share.

No GPS, no phone network, no app needed during play: the units talk only to each other.