# USBL Hardware Options **URL:** \ **Category:** Sonar and Acoustics\ **Tags:** positioning\ **Created:** [February 22, 2025, 9:26am UTC](https://discuss.bluerobotics.com/t/usbl-hardware-options/19482 "2025-02-22T09:26:47Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![3dMB](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/3dmb/32/13905_2.png) [@3dMB](https://discuss.bluerobotics.com/u/3dMB)\ **Post date:** [February 22, 2025, 9:26am UTC](https://discuss.bluerobotics.com/t/usbl-hardware-options/19482/1 "2025-02-22T09:26:47Z")
I am now looking at buying a USBL for my BR2. I have done a forum search and see that all previous USBL recommendation posts are many years old and no doubt technology has moved along a fair bit since then. I am looking for a USBL unit, I already have a Cerulean Tracker650, so the Cerulean ROV Locators would be the obvious units to look at first, however is there something out there that would suit my needs more? I am looking for a unit to be used primarily from concrete or rock quaysides, however some occasional boat use. I would like a unit that will compliment the Tracker 650 and not argue with it. I would like to be able to have a unit where the topside software will store a file (CSV or similar) with Time & location data. I am not looking for survey grade, high accuracy is not so important but high precision would be nice. What are peoples thoughts, please? ---
**Author:** ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/18385_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)\ **Post date:** [February 22, 2025, 6:05pm UTC](https://discuss.bluerobotics.com/t/usbl-hardware-options/19482/2 "2025-02-22T18:05:37Z")
Hi @3dMB - The ROVL Mk2 compliments the Tracker650 quite well - if you’re ok with Windows only software (that is a bit of a pain to use) you can fuse the DVL and ROVL position estimates and send them to the vehicle from the Cerulean Tracker software - make sure you install the latest version! The topside does’t store the file you’re looking for, but a standard .BIN log (found under Autopilot logs, taken for as long as vehicle is armed) has all the information you need, and can easily be reviewed with this [tool](https://plot.ardupilot.org/). Exporting the data from there is possible. ---
**Author:** ![3dMB](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/3dmb/32/13905_2.png) [@3dMB](https://discuss.bluerobotics.com/u/3dMB)\ **Post date:** [February 22, 2025, 8:14pm UTC](https://discuss.bluerobotics.com/t/usbl-hardware-options/19482/3 "2025-02-22T20:14:47Z")
It is interning that you say the mk2 as opposed ot the mk3 - is this due to what you have experience with or is there something that the mk2 does better than the mk3? ---
**Author:** ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/18385_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)\ **Post date:** [February 23, 2025, 3:07pm UTC](https://discuss.bluerobotics.com/t/usbl-hardware-options/19482/4 "2025-02-23T15:07:13Z")
Hi @3dMB - I’ve only tested with the Mk2 - it is cheaper, and a bit less accurate - this would seem to fit your goals of > I am not looking for survey grade, high accuracy is not so important but high precision would be nice. Either unit would work great with your Tracker 650! ---
**Author:** ![Almostafish](https://avatars.discourse-cdn.com/v4/letter/a/59ef9b/32.png) [@Almostafish](https://discuss.bluerobotics.com/u/Almostafish)\ **Post date:** [July 28, 2025, 6:01pm UTC](https://discuss.bluerobotics.com/t/usbl-hardware-options/19482/5 "2025-07-28T18:01:48Z")
Hi I have a bluerov2 with the tracker 650 and the MK2 rovl unit. It works well but I do have issues with getting the rovl to accept an external GPS feed. Other than that you get a nice amount of information on your ROV location.