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<p>To get millimeter accuracy we need to provide the RTK unit with correction values. Corrections, often called RTCM, help the RTK unit refine its position calculations. RTCM (Radio Technical Commission for Maritime Services) can be obtained from a variety of sources but they fall into three buckets: Commercial, Public, and Civilian Reference Stations.</p>
<p>These companies set up a large number of reference stations that cover entire regions and countries, but charge a monthly fee. They are often easy to use but can be expensive.</p>
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<ul>
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<li>
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<p><ahref="https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/quickstart-torch/#pointperfect-corrections" target="_blank" rel="noopener">PointPerfect</a> ($8/month) - US, EU, as well as parts of Australia, Brazil, and South Korea.</p>
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<divclass="admonition note">
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<pclass="admonition-title">Note</p>
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<p>This is an SSR service.</p>
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</div>
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</li>
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<li>
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<p><ahref="https://console.onocoy.com/explorer" target="_blank" rel="noopener">Onocoy</a> ($25/month) - US, EU, Australia, and many other partial areas</p>
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</li>
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<li><ahref="https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/quickstart-torch/#pointperfect-corrections" target="_blank" rel="noopener">PointPerfect</a> ($8/month) - US, EU, as well as parts of Australia, Brazil, and South Korea. Note: This is an <ahref="https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/correction_sources/#osr-vs-ssr" target="_blank" rel="noopener">SSR service</a>.</li>
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<li><ahref="https://console.onocoy.com/explorer" target="_blank" rel="noopener">Onocoy</a> ($25/month) - US, EU, Australia, and many other partial areas</li>
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<li><ahref="https://app.pointonenav.com/trial?src=sparkfun" target="_blank" rel="noopener">PointOneNav</a> ($50/month) - US, EU, Australia, South Korea</li>
<p>The European Union launched a free correction service called <ahref="https://www.gsc-europa.eu/galileo/services/galileo-high-accuracy-service-has" target="_blank" rel="noopener">High Accuracy Service</a> or <strong>HAS</strong> starting in 2023. The service is delivered over the E6 frequency. In general, this service will greatly improve accuracy to receivers but is lower accuracy than an OSR or SSR-based RTK Fix. Additionally, a receiver can take up to 5 minutes to benefit from these corrections (convergence time is larger), as opposed to OSR (seconds) or SSR (~180 seconds) to achieve maximum accuracy. But HAS is free! And available with very little additional configuration.</p>
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<p>Various SparkFun RTK products support this new GNSS band (E6). In general, the RTK Torch will need UM980 firmware 118333 or newer. See how to <ahref="../firmware_update/#updating-um980-firmware">Update the UM980 Firmware</a> for instructions. HAS/E6 is enabled by default and can be disabled in the <ahref="../menu_gnss/#galileo-e6-corrections">GNSS Menu</a> if desired.</p>
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<p>Various SparkFun RTK products support this new GNSS band (E6).
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* The RTK EVK does not support E6 reception.
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* The RTK Postcard's LG290P GNSS receiver has the ability to receive the E6 signals but as of writing, HAS is not yet implemented in the GNSS location engine.
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* The RTK Torch will need UM980 firmware 118333 or newer. See how to <ahref="../firmware_update/#updating-um980-firmware">Update the UM980 Firmware</a> for instructions. HAS/E6 is enabled by default and can be disabled in the <ahref="../menu_gnss/#galileo-e6-corrections">GNSS Menu</a> if desired.</p>
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