So the song was made famous when covered by Kyuss for their final album - but I never realised they released a proper version as per the bandcamp blurb below:

One of these tracks of notable mention is the song “CATAMARAN”, a Yawning Man song made popular by the legendary influential desert rock band KYUSS on the 1995 Elektra release “And the Circus Leaves Town”. The song was never released by Yawning Man, however the KYUSS cover of the song proved to be a favorite among KYUSS fans. Spreading the word about Yawning Man’s unique rock music. Yawning Man will finally release this classic, properly recorded for the first time in 30 years.