The “LEMOn GPS” (Location Enhancement for Mobile GPS) app by GESP improves both the accuracy and the reliability of the point geolocation, thanks to a statistical algorithm that uses the GPS/GNSS positions received by the smartphone or by an external Bluetooth device.

Are you looking for an app that allows you to geolocalize the point where you are?

Would you like to know in real time the reliability of your position?

Would you record this information and export them quickly in a GIS or CAD software?

Then “LEMOn GPS” is the app you are looking for!

Download it from Google Play Store, try it and contact us by writing to This email address is being protected from spambots. You need JavaScript enabled to view it. !



Using “LEMOn GPS” you can:

  • improve the static positioning, using the GPS/GNSS sensor of your smartphone;
  • reduce positioning noise due for example to temporary obstructions or electromagnetic interferences, thanks to the new statistical algorithm;
  • check in real time the reliability of the improved positioning;
  • view GPS, GLONASS and SBAS satellites in use (depending on the connected device);
  • display additional data concerning positioning, like the signal-to-noise ratio for each tracked satellite;
  • save measured points in different horizontal position representations (both UTM projection and geographic coordinate system), and display them on a map (restricted feature in the free version);
  • export the saved points in Comma Separated Values (CSV) text format, and share them via email, Bluetooth or using apps on your smartphone.
LEMOn ScreenShot 1



Buying the “LEMOn GPS Pro” version, you can unlock the following additional features:

  • use external GPS/GNSS Bluetooth devices (NMEA 0183 standard protocol, GPGGA and GPGSV messages required) to achieve higher accuracies;
  • record an infinite number of jobs and points;
  • export points in the Keyhole Markup Language (KML) format, for quick use in other software such as Google Maps or Google Earth.


LEMOn ScreenShot 2



  1. Create a new job to save your points, or activate an existing job;
  2. Get closer to the point that you want to measure, and wait to have a good number of satellites in view (at least four satellites must be tracked);
  3. Start recording points, keeping your phone or external device stable on the target point for at least 15-30 seconds;
  4. Stop recording, and enter the point name;
  5. Continue with a new point!


Do you want more details on how to use the app?

Download and try the free version or buy the “Pro” version from Google Play Store:


Try “LEMOn GPS” version (for free, with restrictions): Icona LEMOn GPS

Buy “LEMOn GPS Pro” version (only EUR 2.99): Icona LEMOn GPS Pro


The “LEMOn GPS” and “LEMOn GPS Pro” by GESP srl are part of a larger project focused on develop tools and services for smart surveys using mobile devices.

For further information about the use of our app and the achievable accuracies, and for any customization, please contact the developers writing to:  This email address is being protected from spambots. You need JavaScript enabled to view it. .


  • The final positioning accuracy depends on the smartphone model, on the external environment and on possible obstacles (buildings, trees, pylons ...) that may disturb the satellite signal tracking.
  • If you plan to use our app with external GPS/GNSS devices, you should verify that they are enabled to send messages via Bluetooth according to the NMEA 0183 standard protocol (minimum required messages: GPGGA and GPGSV). If you have any doubts, please contact the GNSS device supplier for information regarding this option. GESP srl is not accountable for the incorrect purchase of external GPS/GNSS devices that do not work with the “LEMOn GPS Pro" app.
  • The internet access permissions are only necessary to display satellite images on map. The app does not require a cellular or WiFi connection to work.
  • The Bluetooth permission is necessary in the “LEMOn GPS Pro” version, to connect to your external GPS/GNSS device.
  • Privacy: In order to work properly, the "LEMOn GPS" and "LEMOn GPS Pro" apps require some user's device permissions (location, device memory, address book) only for position calculation, for saving data log and sending it by mail or other sharing services. No data is sent to GESP Srl or to third parties. For further details, please read our Privacy Policy.


The improved position algorithm was developed and tested with the valuable contribution of the Polytechnic University of Turin – Dept. of Environment, Land and Infrastructure Engineering.

We would also like to thank the Dual Electronics Corporation, which has provided its GPS/GNSS bluetooth devices for our testing and evaluation.