Open-Water Swimming GPS Timing: From Jeddah to Dubai 25km Races

Open-water swimming events — the Jeddah Sea Crossing, the Dubai 25km, the NEOM Open Water Cup — share more in common with marathons than with pool swimming. Touch pads are useless. Lap markers are unreliable. The entire timing stack is GPS + transponder + boat-mounted referee + post-race course-trace validation.

The transponder, on the swimmer's ankle

A waterproof RFID transponder on each swimmer's ankle is the primary timing chip. It reads at start/finish gates (passive UHF mats on a floating start barge). It also reads at intermediate buoys equipped with RFID gateways.

Boat-mounted GPS for course validation

A separate GPS tracker on a flotation pack on each swimmer records the actual course taken. This is for post-race course-compliance validation — did the swimmer round the correct buoy in the correct direction?

Live leaderboard via boat-relayed mesh

Open-water races run further offshore than cellular coverage. We deploy a chain of safety boats with mesh radio relays back to shore. Position updates relay in ~3 second windows.

Saudi + GCC delivery

Skyline has run open-water timing for Jeddah Sea Crossing (since 2023), Dubai 25 km (annual), and the NEOM Open Water Cup. The kit is portable — flies in on two pelican cases, sets up in a day.