# + Reference Station With the mission data uploaded, the next step is to upload reference station data to be utilized for PPK (Post-Processed Kinematic) trajectory post processing. If a reference station is not uploaded, Navlab will default to the less accurate PPP (Precise Point Positioning) trajectory post processing. ## Video Tutorial {% embed url="" %} ![](/files/-MT5Dn99H2DWzKP5KB7C) In the **Reference Station** tab, click the red plus button to "Create new reference station artifact". ![](/files/-MT5DoejcIvfI8g185le) Multiple reference station files can be uploaded simultaneously if they share the same position, but differ in time. Upload files separately if the various reference station positions are not identical. ![](/files/-MT5Dqe_kFBtA5LpsGMm) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs-6.phoenixlidar.com/lidarmill-cloud/workflow/reference-station.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.