# GPS positioning problem in Lambert 93 **URL:** \ **Category:** Ask the Community\ **Tags:** gh-import\ **Created:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560 "2025-05-14T02:34:31Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/1 "2025-05-14T02:34:31Z")
Hrllo, I am testing GPS location on QField windows with a simulator: Virtual GPS. If my Qfield project is in EPSG 4326, no problem. If it is in EPSG 2154 (Lambert 93), the GPS position and the shp layers (also in 2154) are very off. Do I always have to work in EPSG 4326? THANKS Cordially Gerard * * * _Imported from [GitHub discussion](https://github.com/opengisch/qfield/discussions/4258) by @geguill on 2023-05-04T13:34:14Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/2 "2025-05-14T02:34:33Z")
geguill , can you define very off? * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-5806131) by @nirvn on 2023-05-04T14:06:38Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/3 "2025-05-14T02:34:35Z")
Sorry. GPS position is in the wrong place relative to the layers. * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-5806298) by @geguill on 2023-05-04T14:22:58Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/4 "2025-05-14T02:34:36Z")
Heh, that was clear already šŸ˜‰ are we talking about 1 meter off or ā€œthe other side of the globeā€ off? * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-5806349) by @nirvn on 2023-05-04T14:27:27Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/5 "2025-05-14T02:34:38Z")
About 5000 km to the south * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-5806381) by @geguill on 2023-05-04T14:29:41Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/6 "2025-05-14T02:34:40Z")
geguill , ok, if you can attach a test project with a video thatā€™d be of help Iā€™d try to check whether an epsg 4236 point layer reprojects properly in your epsg 2154 project within QGIS first. If thereā€™s a problem there, itā€™s likely a project setting issue. * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-5806440) by @nirvn on 2023-05-04T14:35:10Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/7 "2025-05-14T02:34:41Z")
[essai\_5.zip](https://github.com/opengisch/QField/files/11398871/essai_5.zip) * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-5806823) by @geguill on 2023-05-04T15:07:39Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/8 "2025-05-14T02:34:42Z")
Hi, I have the exact same probleme. [QFIELD Lons.zip](https://github.com/opengisch/QField/files/12095099/QFIELD.Lons.zip) * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-6488602) by @Exebecce on 2023-07-19T12:56:48Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/9 "2025-05-14T02:34:44Z")
Hi, Do you have news about this problem ? It makes a while I didnā€™t use Qfield and Iā€™ve got the same problem with the 2.8.7 version and Lambert 93 project. My vectorial data are in lambert 93, the basemap is also generated in Lambert 93, but when activating the GPS, this one is in WGS84 ! So I canā€™t see the data while activating the GPS off course. In oldest version, I didnā€™t have such a problem. [test\_stavertin\_230905.zip](https://github.com/opengisch/QField/files/12523758/test_stavertin_230905.zip) * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-6914140) by @ludodo on 2023-09-05T12:56:26Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/10 "2025-05-14T02:34:46Z")
To complete, I downgrade Qfield to version 2.7.6 and it works great, so something has been broken. * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-6914567) by @ludodo on 2023-09-05T13:35:59Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/11 "2025-05-14T02:34:47Z")
ludodo , could you try to provide us with NMEA logs of your device from QField? Documentation on how to do that is found here: [Positioning (GNSS) - QField Ecosystem Documentation](https://docs.qfield.org/how-to/gnss/#external-receiver-log) * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-6915275) by @nirvn on 2023-09-05T14:31:48Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/12 "2025-05-14T02:34:49Z")
For me, the problem has been solved by deleting Qfield from the smartphone and installing it back. Le 5 septembre 2023 16:31:59 GMT+02:00, Mathieu Pellerin _ **@** _.\*\*\*\> a Ć©crit : > ludodo , could you try to provide us with NMEA logs of your device from QField? > > Documentation on how to do that is found here: [Positioning (GNSS) - QField Ecosystem Documentation](https://docs.qfield.org/how-to/gnss/#external-receiver-log) > > ā€“ > Reply to this email directly or view it on GitHub: > [GPS positioning problem in Lambert 93 Ā· opengisch/QField Ā· Discussion #4258 Ā· GitHub](https://github.com/opengisch/QField/discussions/4258#discussioncomment-6915275) > You are receiving this because you commented. > > Message ID: _ **@** _.\*\*\*\> > Fabien Leprince * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-6917382) by @Exebecce on 2023-09-05T18:14:54Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/13 "2025-05-14T02:34:50Z")
Not for us, and on twos different devices * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-6947772) by @ludodo on 2023-09-08T12:17:00Z_ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex018/uploads/qfield/original/1X/7d3726da0ef5099a1e135505c03d2f125d527aae.png) [@system](https://community.qfield.org/u/system)\ **Post date:** [14 May 2025 02:34 UTC](https://community.qfield.org/t/gps-positioning-problem-in-lambert-93/560/14 "2025-05-14T02:34:52Z")
I do not use an external receiver. so I donā€™t have the option proposed in the positionning window. On one off the device, installing a version 2.7.6 works, and then, update to 2.8.7 doesnā€™t brake the resolution. But on anther device (crosscall), it doesn(t work with any version. * * * _Imported from [GitHub comment](https://github.com/opengisch/QField/discussions/4258#discussioncomment-6947878) by @ludodo on 2023-09-08T12:29:44Z_