--- title: SmartFix RTK Float Issues & Accuracy Guide description: "SmartFix RTK Float Issues & Accuracy Guide\nYou have successfully connected to the SmartFix server, you are receiving data (baud rate/Kbps is ticking up), but your rover is stuck in an autonomous or Float RTK state instead of achieving a Fixed position.\nFollow these steps to diagnose the issue." --- [Skip to content](https://knowledgebase.globalsurvey.co.nz/smartfix-rtk-float-issues-accuracy-guide#main-content) [![logo](https://knowledgebase.globalsurvey.co.nz/hs-fs/hubfs/logo.png?width=372&height=85&name=logo.png)](https://www.globalsurvey.co.nz) Open main navigation Close main navigation Welcome to the Knowledgebase - How can we help? - There are no suggestions because the search field is empty. 1. [Welcome to the Global Survey Knowledgebase](https://knowledgebase.globalsurvey.co.nz/?hsLang=en) 2. [SmartFix](https://knowledgebase.globalsurvey.co.nz/smartfix?hsLang=en) 3. [SmartFix Troubleshooting and Diagnostics](https://knowledgebase.globalsurvey.co.nz/smartfix?hsLang=en#smartfix-troubleshooting-and-diagnostics) # SmartFix RTK Float Issues & Accuracy Guide You have successfully connected to the SmartFix server, you are receiving data (baud rate/Kbps is ticking up), but your rover is stuck in an autonomous or **Float** RTK state instead of achieving a **Fixed** position. Follow these steps to diagnose the issue. #### 1. Network vs Single Baseline Configuration The most common reason for a rover refusing to fix is a mismatch between the Port, the Mountpoint, and the Rover's internal RTK expected format. - **If you connected to a Regional Port (e.g., 4809):** - You MUST select a mountpoint ending in `singleADV4` (e.g., `AUCKsingleADV4`). - Your rover's network rover type must be set to standard **RTK** or **Single Baseline**. - **If you connected to a Fixed Network Port (e.g., 4819):** - You MUST select a mountpoint ending in `fixedADV4` (e.g., `AUCKfixedADV4`). - Your rover's network rover type must be set to **i-Max** (Master-Auxiliary Concept) or **VRS** (Virtual Reference Station), depending on the brand. Note: SmartFix natively processes i-Max. #### 2. Satellite Visibility & Obstructions It requires physical satellite geometry to achieve a centimeter-level lock. ![satellite\_dropout](https://knowledgebase.globalsurvey.co.nz/hs-fs/hubfs/satellite_dropout.png?width=600&height=600&name=satellite_dropout.png) **Check your PDOP/GDOP:** Navigate to the satellite tracking page on your controller. High PDOP (above 3.0) indicates poor constellation geometry. 1. **Count common satellites:** Your rover must see the *same* satellites that the SmartFix base station sees. If your rover is under heavy canopy, deep in an urban canyon, or next to a multi-story building, it may track satellites, but not enough *shared* satellites to resolve the ambiguities. #### 3. Distance to the Base Station If you are using a Single Baseline mountpoint, the distance (baseline length) between your rover and the physical reference station matters. - As a general rule, initialisation time increases and accuracy degrades by approximately 1ppm per kilometre. - If you are 40km+ away from the selected reference station, atmospheric modelling degrades. - **Solution:** Check the [Live Network Status Map](https://knowledgebase.globalsurvey.co.nz/check_smartfix_live_network_status.md?hsLang=en) to ensure you are connected to the closest physically active station. If not, disconnect and select the mountpoint for the closer station. #### 4. Hardware Antenna Health If you are in an open sky environment, connected to the correct port, and within 10km of a base station, but still cannot fix: \* Ensure the antenna cable (if using a modular receiver and external antenna) is secure and undamaged. \* Verify your hardware is capable of tracking multi-frequency (L1/L2) signals. 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