# Here 2 can update

**URL:** <https://discuss.cubepilot.org/t/here-2-can-update/471>\
**Category:** Here GPS\
**Created:** [17 April 2019 00:43 UTC](https://discuss.cubepilot.org/t/here-2-can-update/471 "2019-04-17T00:43:13Z")\
**Posts on this page:** 1\
**Showing post:** 165

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**Author:** ![philip](https://discuss.cubepilot.org/user_avatar/discuss.cubepilot.org/philip/32/9035_2.png) [@philip](https://discuss.cubepilot.org/u/philip)\
**Post date:** [14 September 2019 22:36 UTC](https://discuss.cubepilot.org/t/here-2-can-update/471/165 "2019-09-14T22:36:49Z")

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> [@Matt.C](#):
>
> Do please elaborate on why hdop is not a good measure of accuracy

That’s easy.  
HDOP is a retrospective indication of accuracy  
We use the velocity errors as the measure of GPS accuracy, this allows ardupilot to detect a glitch as it happens, rather than after it happened.

However, we acknowledge that it has caused a lot of confusion, so will most likely be adding it again

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