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<li>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.</li>
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<li>The RTK Torch fully supports HAS/E6. The UM980 firmware needs to be 11833 or newer. See how to <ahref="../firmware_update_um980/">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.</li>
<p>Some companies broadcast an extra signal over geosynchronous satellites in something called the 'L-Band' which is really just a catch-all name for any broadcast between 1GHz and 2GHz. Because GNSS satellites broadcast their signal at ~1.57GHz (L1) and ~1.23GHz (L2), it is beneficial to broadcast an extra signal near these frequencies because the GNSS receiver hardware can be adapted to pick up this extra signal. Depending on the company, this signal adds additional correction data that can allow a GNSS receiver to obtain much higher accuracy than L1/L2/L5 positioning alone. But because broadcasting on satellites is exorbitantly expensive, the signal is often encrypted to force users to pay a subscription fee. The benefit of L-Band corrections is that they can cover an entire country or continent with corrections, without the need for internet connectivity, allowing for remote location to be surveyed, or scientific research conducted.</p>
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<p>For many years, u-blox provided a service called PointPerfect L-Band that was compatible with certain SparkFun RTK products (specifically <ahref="https://www.sparkfun.com/sparkpnt-rtk-facet-mosaic-l-band.html" target="_blank" rel="noopener">RTK Facet mosaic L-Band</a>, and <ahref="https://www.sparkfun.com/sparkfun-rtk-facet-l-band.html" target="_blank" rel="noopener">RTK Facet L-Band</a>). Unfortunately, in July of 2025 u-blox announced the L-Band service to North America would be discontinued on December 31st, 2025. These products still function as high precision receivers, but they will need to switch to an internet based correction services to obtain an RTK Fix.</p>
<p>What do you do if you need to get an RTK Fix but there is no L-Band or internet service? So how can users obtain corrections in remote areas? There are a few options.</p>
<p>A base can be set on site and surveyed in with high accuracy in about 12 hours. Once that is completed a base can transmit corrections to the rover allowing the rover to obtain RTK Fix with high absolute accuracy. The connection between the rover and base can be accomplished with a variety of options. Please see <ahref="../correction_transport/">Correction Transport</a> for more information.</p>
<p>A few innovative users have reported using <ahref="https://europe.konnect.com/en-DE" target="_blank" rel="noopener">Eutelsat KONNECT</a> or <ahref="https://www.starlink.com/us/roam" target="_blank" rel="noopener">Starlink Roam</a> to gain internet connectivity in remote areas to then connect to a standard NTRIP corrections source.</p>
<p>If real time kinematics is not needed, many SparkFun PNT devices can log raw GNSS satellite data onto an SD card where it can be post processed into very accurate location data.</p>
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