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Swim streamer

From Openwaterpedia
(Redirected from Swimmer's guide)
photo courtesy of Christi Barli
Swim streamer at night with red LED lights on the cloth
photo courtesy of Christi Barli
photo courtesy of Christi Barli

noun - A swim streamer (or sarashi or さらし (in Japanese) is a piece of cloth or illuminated material that is runs underneath an open water swimmer or parallel to an escort boat for the benefit of guiding and protecting a marathon swimmer during an ocean swim or channel crossing.


The swim streamer cloth or material is used during daytime hours; the material is illuminated during the nighttime hours for easier viewing. The navigational aid is hoisted from the escort boat and anchored in the water so the cloth or material runs 1-3 meters underneath the surface of the water.


The swim streamer serves to help guide the swimmer and as a shark deterrent if the swimmer swims directly above the submerged swim streamer.


Diana Nyad used a swimmer's streamer during her swim from Cuba to Florida.


  • The marathon swimmer can look straight down in the water at the swim streamer on every stroke in order swim straight (i.e., parallel to the escort boat).
  • The swimmer can also conserve energy and improve their navigational course by not constantly looking up at the boat, especially during the night.
  • Sharks can be deterred by its proximity to the swimmer.

Use Around The World[edit]

Video of Swim Streamer in Tsugaru Channel and Sado Channel[edit]

The swim streamer and the pole of the swim streamer can be seen in the videos of the Tsugaru Channel and Sado Channel crossings.


Swimmer's streamer, Swimmer's guide, sarashi (さらし in Japanese), underwater streamer, streamer

External links[edit]