> For the complete documentation index, see [llms.txt](https://docs.phoenixlidar.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.phoenixlidar.com/hardware-and-interfaces/navbox/scout/questions-and-troubleshooting.md).

# Questions & Troubleshooting

## The unit is unable to obtain GNSS time synchronization which prevents the system from collecting data.

For single GPS antenna setups, please make sure that the external GPS antenna is connected to the ANT1 port on the front-panel of the SCOUT NavBox. Connecting the antenna to the ANT2 port will result in the unit not synchronizing GNSS time.