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docs/accuracy_verification.md

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# Base Menu
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# Accuracy Verification
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Surveyor: ![Feature Supported](img/GreenDot.png) / Express: ![Feature Supported](img/GreenDot.png) / Express Plus: ![Feature Supported](img/GreenDot.png) / Facet: ![Feature Supported](img/GreenDot.png) / Facet L-Band: ![Feature Supported](img/GreenDot.png)
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![Facet in the field](img/VerifyAccuracy/SparkFun%20Verify%20RTK%20-%2016%20Facet%20in%20the%20Field.jpg)
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*Facet in the field*
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You’ve got an incredibly powerful GNSS receiver in your hands. How do you verify that you can get really accurate location readings? It's a bit of work but it's a lot of fun and you'll learn a tremendous amount about surveying along the way.
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This is, admitedly, a very US-centric tutorial. We hope that it will provide some of the tools and basic guidance to be replicated in other countries. If you have additional sources for GPS/GNSS surveyed monuments in your own country, consider [adding them](/contribute) to this document!
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This is a replication and confirmation of the procedure done by [RTKLibExplorer in 2018](https://rtklibexplorer.wordpress.com/2018/03/17/measuring-a-survey-marker-with-the-datagnss-d302-rtk/). We modified it to demonstrate a similar process but using u-blox hardware and with a few updates.
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Before you head out into the field, there are a few steps to get through:
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The process goes like this:
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* Find a local monument
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* Covert the coordinates
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* Take measurements
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* Calculate differences
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## Get an RTK Fix
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## Get Used to RTK
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Verify you can get your device into RTK Fix mode. This includes setting up a permanent base and/or using a service like Skylark to provide the correction data to the RTK product. Before planning a trip to the field get really used to using the RTK product in Rover mode with NTRIP corrections being passed over Bluetooth to your device.
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Before we can consider doing anything in the field, we need to get really comfortable using the RTK product. Verify you can get your device into RTK Fix mode. This includes setting up a permanent base and/or using a service like Skylark to provide the correction data to the RTK product. Before planning a trip to the field get really used to using the RTK product in Rover mode with NTRIP corrections being passed over Bluetooth to your device.
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## Locate GPS Monument
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