# IMU calibration does not work on water! **URL:** \ **Category:** Sonar and Acoustics\ **Tags:** water-linked, positioning, underwater-gps\ **Created:** [June 2, 2020, 7:36am UTC](https://discuss.bluerobotics.com/t/imu-calibration-does-not-work-on-water/7468 "2020-06-02T07:36:32Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![HanJIK](https://avatars.discourse-cdn.com/v4/letter/h/858c86/32.png) [@HanJIK](https://discuss.bluerobotics.com/u/HanJIK)\ **Post date:** [June 2, 2020, 7:36am UTC](https://discuss.bluerobotics.com/t/imu-calibration-does-not-work-on-water/7468/1 "2020-06-02T07:36:33Z")
IMU calibration does not work on water I am using Waterlinked U1 GPS. After IMU calibration before completing the receiver, If it is used for 1~2 minutes, the IMU will turn red. Is there any way to keep the IMU green??? Does it matter if IMU is red? ---
**Author:** ![Boko](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/boko/32/7241_2.png) [@Boko](https://discuss.bluerobotics.com/u/Boko)\ **Post date:** [June 2, 2020, 10:17pm UTC](https://discuss.bluerobotics.com/t/imu-calibration-does-not-work-on-water/7468/2 "2020-06-02T22:17:32Z")
> [@Water Linked losing IMU calibration on boat](https://discuss.bluerobotics.com/t/water-linked-losing-imu-calibration-on-boat/7450/2): > > Hi Mateo! Waterlinked IMU is a problem to calibrate, it keeps drifting. [https://waterlinked.com/forums/topic/questions-on-waterlinked-utilisation-on-a-boat/](https://waterlinked.com/forums/topic/questions-on-waterlinked-utilisation-on-a-boat/) Only way for us is to use external heading (and positioning) One solution is: [Mounting Waterlink on a moving boat - #9 by ScottM](https://discuss.bluerobotics.com/t/mounting-waterlink-on-a-moving-boat/4467/9) Integration via python, or WL solution: [https://waterlinked.com/forums/topic/water-linked-underwater-gps-nmea-bridge/](https://waterlinked.com/forums/topic/water-linked-underwater-gps-nmea-bridge/) Bo ---
**Author:** ![HanJIK](https://avatars.discourse-cdn.com/v4/letter/h/858c86/32.png) [@HanJIK](https://discuss.bluerobotics.com/u/HanJIK)\ **Post date:** [June 19, 2020, 4:36am UTC](https://discuss.bluerobotics.com/t/imu-calibration-does-not-work-on-water/7468/3 "2020-06-19T04:36:22Z")
Thank you~~~