# Height of VEL3D sensors on RCN

**URL:** <https://discourse.oceanobservatories.org/t/height-of-vel3d-sensors-on-rcn/817>\
**Category:** HelpDesk\
**Created:** [September 5, 2024, 4:42pm UTC](https://discourse.oceanobservatories.org/t/height-of-vel3d-sensors-on-rcn/817 "2024-09-05T16:42:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zkrauss](https://avatars.discourse-cdn.com/v4/letter/z/5f8ce5/32.png) [@zkrauss](https://discourse.oceanobservatories.org/u/zkrauss)\
**Post date:** [September 5, 2024, 4:42pm UTC](https://discourse.oceanobservatories.org/t/height-of-vel3d-sensors-on-rcn/817/1 "2024-09-05T16:42:12Z")

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Hi OOI,

I’m looking for the height at which seafloor 3-D velocity measurements are taken. Specifically, for the VEL3D instruments at Slope Base and Hydrate Ridge:

- Slope Base (RS01SLBS-MJ01A-12-VEL3DB101)
- Hydrate Ridge (RS01SUM1-LJ01B-12-VEL3DB104)

As far as I can tell online, the actual measurement is taken ~1 m above the seafloor. Is the exact height of the measurement (above the seafloor) known?

Thanks so much!  
-Zoe

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**Author:** ![danb4301](https://avatars.discourse-cdn.com/v4/letter/d/67e7ee/32.png) [@danb4301](https://discourse.oceanobservatories.org/u/danb4301)\
**Post date:** [September 9, 2024, 3:05pm UTC](https://discourse.oceanobservatories.org/t/height-of-vel3d-sensors-on-rcn/817/2 "2024-09-09T15:05:29Z")

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Hello Zoe,

Received this answer from Dana (manalang@uw.edu) at UW:

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These velocity instruments are mounted to tripods on the seafloor. The sensor end sits about 1m above the seabed.

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