# Info about eph and epv

**URL:** <https://discuss.px4.io/t/info-about-eph-and-epv/2237>\
**Category:** Uncategorized\
**Created:** [January 21, 2017, 5:59am UTC](https://discuss.px4.io/t/info-about-eph-and-epv/2237 "2017-01-21T05:59:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mahesh\_saraswat](https://discuss.px4.io/letter_avatar_proxy/v4/letter/m/a698b9/32.png) [@mahesh\_saraswat](https://discuss.px4.io/u/mahesh_saraswat)\
**Post date:** [January 21, 2017, 5:59am UTC](https://discuss.px4.io/t/info-about-eph-and-epv/2237/1 "2017-01-21T05:59:39Z")

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Hi,  
In Qgroundcontrol I could see two parameters eph and epv. Default value for these parameters is 3 and 5.  
Can anyone give me more details about horizontal position error and vertical position error.  
If I set Min value(eph and epv = 1) will accuracy of estimated position data improve? Because I am getting so much variation in estimated position data.