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---
page_type: sample
description: "Provides base sample driver that IHVs and partners can use to extend to build their custom Windows GPS/GNSS drivers."
languages:
- cpp
products:
- windows
- windows-wdk
---
# GNSS UMDF Sample Driver (UMDF Version 2)
Provides a base sample driver that IHVs and partners can use to extend to build their custom Windows GPS/GNSS drivers.
## Overview
### What is covered
- This is a sample that adheres to GNSS driver design for Windows 10 outlined in the [GNSS driver design guide for Windows 10](https://docs.microsoft.com/windows-hardware/drivers/gnss/gnss-driver-design-guide-for-windows-10).
- Serves as base sample driver that IHVs and partners can use as a template and guidance to extend to build their custom Windows GNSS drivers.
- Follows the WDF guidelines and best practices around PnP device arrival/removal, power management and driver installation/uninstallation.
- Supports the GNSS DDI mandatory requirements.
- This driver successfully passes HLK tests and WDF tests provided by Visual studio.
### What is not covered
- This sample currently doesn't support Geofence, SUPL, and AGNSS, as this is not mandatory GNSS DDI functionality.
- SUPL and AGNSS are mandatory only if required by mobile operator, and the sample does not support them currently.
- Not a production driver.
### What a Partner needs to do
- Customer can install WDK and run Location HLK tests to validate their driver. All test cases should be either pass or skip without failure.
- Partner owns the following:
- Installing the driver.
- Adding certificate and driver signing.
- Updating manufacturer name driver version etc. (the code has comments to update).
- The GNSS sample code has "FIX ME" comments. Partner should update them accordingly.
## Design
- The sample demonstrates a very basic software only driver that meets the minimum requirements from the GNSS DDI.
- The sample currently always returns a fake hardcoded location. Driver developers can extend this to fetch fake positions from a file or inject through a custom IOCTL or instead implement getting real positions from GNSS hardware.
- Driver developer can extend this to pull the fake positions from a file or through custom IOCTLs if needed.
## Trace Logging
- The sample code provides Trace logging WPRP file.
- To capture trace log, copy GnssUmdfSampleDriver.wprp in the solution folder into the device under test. On command line (MyLog.etl is an example file name below):
```cmd
wpr -start GnssUmdfSampleDriver.wprp -filemode
<Reproduce the issue>
wpr -stop MyLog.etl
```
- Inspect MyLog.etl with trace file analyzer. Note that corresponding PDB file is needed to decode the logging information.
## Test Plan
Customer should validate their driver after customizing it.
### Test method 1
- This tests WDF fundamental functionality (PnP etc.), rather than Location-specific features.
- Run Visual studio built-in run-time test for WDF.
- General information available at [](https://docs.microsoft.com/windows-hardware/drivers/develop/testing-a-driver-at-runtime).
- Expected result / Pass criteria: Pass rate 100%
### Test method 2
- This tests Location-specific functionality (Getting fix etc.).
- Run [HLK](https://docs.microsoft.com/windows-hardware/test/hlk/windows-hardware-lab-kit) tests with existing and standard GNSS driver tests.
- Run "TE.exe GNSSDriverTest.dll".
- Expected result / Pass criteria: Pass rate 100%
- Note that this sample does not support AGNSS, SUPL and Geofencing currently. Based on the capability of driver, HLK skips them automatically.
### Test method 3
- Test the [Windows Geolocation API](https://docs.microsoft.com/windows/desktop/locationapi/windows-location-api-portal) layer on real apps.
- Get current location by clicking on "Show my location" from the In-box Windows Maps app.
- Run the tracking scenario from the [Geolocation Sample app](https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/Geolocation).
- Get current location by clicking on "Start" from GPS Satellite app in Windows Store.
## Resources
[GNSS DDI reference](https://docs.microsoft.com/windows-hardware/drivers/ddi/content/gnssdriver/index)
[Getting started with Windows drivers](https://docs.microsoft.com/windows-hardware/drivers/gettingstarted)
[Windows Driver Kit documentation](https://docs.microsoft.com/windows-hardware/drivers)
[NMEA format documentation](https://navspark.mybigcommerce.com/content/NMEA_Format_v0.1.pdf)
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