# Compass inside aluminium tube

**URL:** <https://discuss.bluerobotics.com/t/compass-inside-aluminium-tube/1288>\
**Category:** ArduSub\
**Created:** [July 18, 2017, 8:44am UTC](https://discuss.bluerobotics.com/t/compass-inside-aluminium-tube/1288 "2017-07-18T08:44:26Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![S4ndm4nn](https://avatars.discourse-cdn.com/v4/letter/s/3bc359/32.png) [@S4ndm4nn](https://discuss.bluerobotics.com/u/S4ndm4nn)\
**Post date:** [July 18, 2017, 8:44am UTC](https://discuss.bluerobotics.com/t/compass-inside-aluminium-tube/1288/1 "2017-07-18T08:44:26Z")

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Hi there,

is there any possibility to use the internal compass inside an aluminium tube?

 ![](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/f/fa75598e376bd952d7dd41697b264d295970e72a.jpg)

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**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:** [July 18, 2017, 11:09am UTC](https://discuss.bluerobotics.com/t/compass-inside-aluminium-tube/1288/2 "2017-07-18T11:09:35Z")

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Hi  
I use BlueRov original 4" alutube as electronics compartment with working internal Compass.  
Aluminium is not magnetic.  
Good luck!

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**Author:** ![S4ndm4nn](https://avatars.discourse-cdn.com/v4/letter/s/3bc359/32.png) [@S4ndm4nn](https://discuss.bluerobotics.com/u/S4ndm4nn)\
**Post date:** [July 18, 2017, 11:26am UTC](https://discuss.bluerobotics.com/t/compass-inside-aluminium-tube/1288/3 "2017-07-18T11:26:39Z")

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i tried to calibrate the compass but it allways fails.

is there a trick to do that?

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**Author:** ![jwalser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jwalser/32/2234_2.png) [@jwalser](https://discuss.bluerobotics.com/u/jwalser)\
**Post date:** [July 18, 2017, 10:13pm UTC](https://discuss.bluerobotics.com/t/compass-inside-aluminium-tube/1288/4 "2017-07-18T22:13:10Z")

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@S4ndm4nn Try increasing the value of the COMPASS\_OFS\_MAX parameter. I think that will do the trick.

-Jacob