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Beware! For those still running DM24-type Guralp digitizers there may be a timing issue on May 30 2021 if the firmware is not upgraded or the GPS unit is not swapped. </div>
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-Patrick</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Güralp Support <support@guralp.com><br>
<b>Sent:</b> Monday, March 1, 2021 4:37 AM<br>
<b>Subject:</b> [EXTERNAL] Reminder of Week Number Roll Over event on 29th May 2021</font>
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<p style="margin-top: 0px; margin-bottom: 0px;text-align:center"><strong> This email has been received from outside of DOI - Use caution before clicking on links, opening attachments, or responding. </strong></p>
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<td><span style="font-family:Arial,Helvetica,sans-serif"><span><a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.guralp.com%2F&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796417271%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=B4UUrAR20DjaaZKAtHEalTHPWswgabRsrH%2BUIN44NBg%3D&reserved=0" originalsrc="https://www.guralp.com/" shash="dcundFbClgXLDCTNCaNJJU53kC9kF3r+XGUFs722Uo2ciSffBT+oPV6wgSarzW//olY6G761EgUfmIFpyYH+6ahbKz8OE9veA1BvGIg59MRht+7X3KWjPfz1tM6ZWsxoez3dvMXQFspSqreufvncOH9dgDKvIvzfwOM/vPTLXVg=" originalsrc="https://www.guralp.com/" shash="Wfx9pulZEDXUwmlF4rrG052yG/oGSjEZ9Ee+GcV7zs+ogFm57MkBHTzc2vMN22GgADqRiCikFjtkscFtFi3JzJ4/3e6xSvgUCrTkYmwXMJ1h3DXjEd0FQyxsQ2gAN1Wjx8prtNd/n5CE+DN0H59X7nU98EpJTX06HYSFkr0xcpk=" target="_blank"><img alt="Guralp Logo" width="150" height="62" align="left" style="width:150px; height:62px; float:left" src="https://www.guralp.com/images/Corporate/Guralp.png"></a></span></span></td>
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<div><span style="font-family:Arial,Helvetica,sans-serif"><span><b><span style="font-size:12.0pt"><span><span style="color:rgb(0,103,165)">This is to remind you of the GPS Week Number Roll Over (WNRO) event impacting Lassen iQ receivers on 29th May 2021.</span></span></span></b></span></span></div>
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<div><span style="font-family:Arial,Helvetica,sans-serif"><span><span style="font-size:12pt"><span><span style="font-size:10.5pt"><span><span style="color:black">Further to our email on the 8th January, this is a reminder that some of the older (white) GPS
receivers we have supplied in the past will stop providing accurate dates after the 29th May, 2021 unless remedial action is taken in advance.</span></span></span></span></span><br>
<span style="font-size:12pt"><span style="word-wrap:break-word!important"><span> </span></span></span><br>
<span style="font-size:12pt"><span style="word-wrap:break-word!important"><span><span style="font-size:10.5pt"><span><span style="color:black">This WNRO event will affect Lassen iQ receivers which, on the 30<sup>th</sup> May 2021, will roll back to report a
date of 14<sup>th</sup> December 2001.</span></span></span></span></span></span><br>
<span style="font-size:12pt"><span style="word-wrap:break-word!important"><span> </span></span></span><br>
<span style="font-size:10.5pt"><span><span style="color:black">You can use the guidance on
<a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Felinkeu.clickdimensions.com%2Fc%2F6%2F%3FT%3DNzQ1NTk0NzA%3AcDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi%3AZXNleW1vdXJAZ3VyYWxwLmNvbQ%3AY29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw%3AZmFsc2U%3AMA%3A%3AaHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI%26K%3DvDwyLGHm3bTtA7zSt5QT_g&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796417271%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=cqwSUfEPrcAVX5O%2FSGpkRqVM%2BtN0TkcbkuG0Dzj91dU%3D&reserved=0" originalsrc="https://elinkeu.clickdimensions.com/c/6/?T=NzQ1NTk0NzA:cDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi:ZXNleW1vdXJAZ3VyYWxwLmNvbQ:Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw:ZmFsc2U:MA::aHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI&K=vDwyLGHm3bTtA7zSt5QT_g" shash="TFOJFFhE+f8tJdUm5GCC3Te1bxaLK6z6WqLVVBomou8oqkCgwI9xHjH57lv5XZiBzBVGonLwYaj5cNd3KtbnSl8c7NUvKOGkXGCH+hQEL5nLA6+aMPEZSgeGMbTLZGDLH8yp0Os0CLwrXjNZvo1NKvTyc6/K5Th80UHlvqcRyv0=" originalsrc="https://elinkeu.clickdimensions.com/c/6/?T=NzQ1NTk0NzA:cDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi:ZXNleW1vdXJAZ3VyYWxwLmNvbQ:Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw:ZmFsc2U:MA::aHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI&K=vDwyLGHm3bTtA7zSt5QT_g" shash="gL5byPWrlfYjYU3GZjxLEIVUDRmnxM/OAhWFMWFza3sU5OS+xMUdppZivhE+/Xeed0F5gXsjGbrSIYm/Y+84R2XLb8/SPi6DZmS6Wfo5wTH/4ziXoCRrlHYtonfv7QQTYCLpfSA673Ux2IVLUfl9UMwkh4iYnr+Qdwho2eEdXmc=" target="_blank" style="color:blue; text-decoration:underline">
<span style="color:rgb(12,0,255)">www.guralp.com/howtos/gps-wnro</span></a> to identify if you are using a Lassen iQ receiver</span></span></span></span></span></div>
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<div><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><b><span><span><span style="color:rgb(0,103,165)">Options for remediation:</span></span></span></b></span></span></div>
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<h4><span style="font-size:11pt"><span style="font-family:'Arial Black',Arial,sans-serif">DM24 Digitisers</span></span></h4>
<span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">If you are using the Lassen iQ GPS receiver with a DM24 Mk3 digitiser,
you can do one of the following:</span></span></span></span><br>
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<li><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span><span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">Update the digitiser with the WNRO firmware update
for the Güralp DM24 Mk3 (this update will also address all future WNRO events including 2032 and 2038)</span></span></span></span></span></span></span></span></li><li><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span><span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">Replace the GPS unit with a new unit that is unaffected
by the WNRO problem</span></span></span></span></span></span></span></span></li><li><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span><span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">Güralp can upgrade your receiver with a new PCB assembly.
This will involve returning your receiver to the factory</span></span></span></span></span></span></span></span></li><li><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span><span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">Your
<a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Felinkeu.clickdimensions.com%2Fc%2F6%2F%3FT%3DNzQ1NTk0NzA%3AcDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi%3AZXNleW1vdXJAZ3VyYWxwLmNvbQ%3AY29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw%3AZmFsc2U%3AMQ%3A%3AaHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9jb250YWN0L2Rpc3RyaWJ1dG9ycz9fY2xkZWU9WlhObGVXMXZkWEpBWjNWeVlXeHdMbU52YlElM2QlM2QmcmVjaXBpZW50aWQ9Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNyZlc2lkPTI5NTk1OTk1LWJlNTEtZWIxMS1hODEyLTAwMGQzYWQ2ODgzMg%26K%3DbP4zFQWY93m3u4IxDYyr5w&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796427223%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=aPNfFijZTzwZxAs7sTbyZGJztohbejG9Tg3sn5NxQb4%3D&reserved=0" originalsrc="https://elinkeu.clickdimensions.com/c/6/?T=NzQ1NTk0NzA:cDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi:ZXNleW1vdXJAZ3VyYWxwLmNvbQ:Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw:ZmFsc2U:MQ::aHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9jb250YWN0L2Rpc3RyaWJ1dG9ycz9fY2xkZWU9WlhObGVXMXZkWEpBWjNWeVlXeHdMbU52YlElM2QlM2QmcmVjaXBpZW50aWQ9Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNyZlc2lkPTI5NTk1OTk1LWJlNTEtZWIxMS1hODEyLTAwMGQzYWQ2ODgzMg&K=bP4zFQWY93m3u4IxDYyr5w" shash="WmEyXgd0w8P1PInJetfDYIpEsD3xFimIQeH7jNuRjcZDef5CJMCrK6/II+Z/bpnULuwNpxOjKxBauGsQXsE2ES4DdNHyO1HrJzIOleB0Ae4s4BKq8RMIgWk9ZQpbVgLizuWRONCDlfO2fHJCEM0hp+CS7AH+x37O5CAOnDURfgI=" originalsrc="https://elinkeu.clickdimensions.com/c/6/?T=NzQ1NTk0NzA:cDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi:ZXNleW1vdXJAZ3VyYWxwLmNvbQ:Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw:ZmFsc2U:MQ::aHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9jb250YWN0L2Rpc3RyaWJ1dG9ycz9fY2xkZWU9WlhObGVXMXZkWEpBWjNWeVlXeHdMbU52YlElM2QlM2QmcmVjaXBpZW50aWQ9Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNyZlc2lkPTI5NTk1OTk1LWJlNTEtZWIxMS1hODEyLTAwMGQzYWQ2ODgzMg&K=bP4zFQWY93m3u4IxDYyr5w" shash="fuOJuRTRWPVTiOL/lWbHZdMJhB+0ICMDDJ0f72ecMCxVc0ofUkTLsYxajxu21qmc6hJfHmFT7FRhEA54lsesWY+f+vk/VkL+rmxgRyf6Gmmnw8GMhv78SXnwwZ/g2Ngby53fVZC3/t2sVi1aLFXvtTVTYwJi19bjwCXq88G7X3I=" target="_blank" style="color:blue; text-decoration:underline">
<span style="color:rgb(12,0,255)">local distributor</span></a> may be able to upgrade your receiver with a new PCB assembly. This will involve returning your receiver to your distributor. Please contact your distributor to see whether they offer this service</span></span></span></span></span></span></span></span></li><li><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span><span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">You can purchase a "field upgrade kit" for your receiver,
which will allow you to replace its existing PCB assembly with a new one which is immune to the WNRO problem</span></span></span></span></span></span></span></span></li></ul>
<h4><span style="font-size:11pt"><span style="font-family:'Arial Black',Arial,sans-serif"><span><span><span><span><span><span><span style="color:black"><span style="font-weight:normal">CD24 Digitisers</span></span></span></span></span></span></span></span></span></span></h4>
<div><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">If you are using the Lassen iQ GPS receiver with a CD24 digitiser
<strong><span>you must replace the GPS unit or upgrade the PCB assembly</span></strong></span></span></span></span><br>
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<span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">Full details on all the options available can be viewed in the guidance here: <a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Felinkeu.clickdimensions.com%2Fc%2F6%2F%3FT%3DNzQ1NTk0NzA%3AcDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi%3AZXNleW1vdXJAZ3VyYWxwLmNvbQ%3AY29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw%3AZmFsc2U%3AMg%3A%3AaHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI%26K%3DoAegRyFNAl2tpgU1eRrAHQ&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796437178%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=aPm9iZqJ7gvuTSQaXtkOIEhyUOP%2Ff7JTXNvtWY5zkLQ%3D&reserved=0" originalsrc="https://elinkeu.clickdimensions.com/c/6/?T=NzQ1NTk0NzA:cDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi:ZXNleW1vdXJAZ3VyYWxwLmNvbQ:Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw:ZmFsc2U:Mg::aHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI&K=oAegRyFNAl2tpgU1eRrAHQ" shash="pt2FlkWP5RTaladseFETM/GoP0AO/8bHbWmIm0j3X09zkTtytoS9HPkEd1YsPpwg2rRVwsGfgRkQ2blVhaCAUy0d6VGg6Y2xqmjxzRDsnd7bvc6oeFYS9/cSgKS6g/A7Xyjq9UG3HFfeb+y3XKzv8NQZ8v/x/wbPk3MtIY3Bcy8=" originalsrc="https://elinkeu.clickdimensions.com/c/6/?T=NzQ1NTk0NzA:cDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi:ZXNleW1vdXJAZ3VyYWxwLmNvbQ:Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw:ZmFsc2U:Mg::aHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI&K=oAegRyFNAl2tpgU1eRrAHQ" shash="SU4XslHfDg3YnCquGvSHFrPwgbaCpF850XxzS/uq9xrM1LBJm0JQjinLubTdLWDjZx5HAsXwN+QUbt2UxVCyLGwC0Gko8GGCqsN2ril6lHZAk5YA0+kLbpXZotxymum1b9wl8+qqIJMLGOQ+JDxIFouCdhjFNFLFufL9/yQEdUc=" target="_blank" style="color:blue; text-decoration:underline"><span style="color:rgb(12,0,255)">www.guralp.com/howtos/gps-wnro</span></a></span></span></span></span></span></div>
<div> </div>
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<h3><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><b><span><span><span style="color:rgb(0,103,165)">Previous WNRO event in 2019</span></span></span></b></span></span></h3>
<span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span style="font-size:10.5pt"><span><span style="color:black">You may recall that there was a similar issue with the WNRO event in 2019 which primarily effected a different
model of GPS receiver (Lassen SQ), and which we communicated in some detail. It is therefore possible that you have already taken the necessary action to avoid the problems arising from the 2021 WNRO event, however, we strongly recommend that you review your
equipment and firmware records to satisfy yourself that this is the case and that no further action is required.</span></span></span><br>
<br>
<span style="font-size:10.5pt"><span><span style="color:black"><span style="word-wrap:break-word!important">Full guidance on the 29th May 2021 WNRO event and the remedial actions that should be taken can be found on our website including:</span></span></span></span></span></span></span>
<ul>
<li><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span><span style="font-size:10.5pt"><span><span style="color:black">Advice on how to identify if you have a lassen iQ receiver</span></span></span></span></span></span></span></li><li><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span><span style="font-size:10.5pt"><span><span style="color:black">Methods for updating DM24 firmware</span></span></span></span></span></span></span></li><li><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:12pt"><span><span><span style="font-size:10.5pt"><span><span style="color:black">Actions to take if purchasing new GPS units for CD24 digitisers</span></span></span></span></span></span></span></li></ul>
<span style="font-family:Arial,Helvetica,sans-serif"> <br>
<span style="font-size:10.5pt"><span style="background:white none repeat scroll 0% 0%"><span><span style="color:black"><span style="word-wrap:break-word!important">For more information read the full guidance here:</span></span></span></span></span><br>
<span style="font-size:10.5pt"><span><span style="color:black"><a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Felinkeu.clickdimensions.com%2Fc%2F6%2F%3FT%3DNzQ1NTk0NzA%3AcDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi%3AZXNleW1vdXJAZ3VyYWxwLmNvbQ%3AY29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw%3AZmFsc2U%3AMw%3A%3AaHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI%26K%3DeXug_jdnX53TEPdWY1Xqog&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796437178%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=PIKF0HSiFocfQ33Kr2t2d%2BzuFL28M8qn7s3rqEyrDKs%3D&reserved=0" originalsrc="https://elinkeu.clickdimensions.com/c/6/?T=NzQ1NTk0NzA:cDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi:ZXNleW1vdXJAZ3VyYWxwLmNvbQ:Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw:ZmFsc2U:Mw::aHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI&K=eXug_jdnX53TEPdWY1Xqog" shash="eiExJ4LvvuuCS4OF99GyNV62hS8FgEqK+mwlAZJxdwJpG1Q7nn0SmmMN8Kfu8u6dqz3Nhv4EA8ufhVZ5FHoB67XnmZ5+F2+wMy5iOOqECrJR7TTKvqBsaSCpmtwRjxfGlItO8aQxeiCmhob3jl8DsBgBnGXiQ7zA0aXPUuYaTJk=" originalsrc="https://elinkeu.clickdimensions.com/c/6/?T=NzQ1NTk0NzA:cDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi:ZXNleW1vdXJAZ3VyYWxwLmNvbQ:Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw:ZmFsc2U:Mw::aHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI&K=eXug_jdnX53TEPdWY1Xqog" shash="fMGMekS7/MgmTtQ2NlDZ+UTl3oqtTWTlk0/gOr//6W+QvaFiNDwqNy2eiuAcec2qZXFqWL3bKbGuJhWZZtCRXAZ8Oyw3ztBVgznG684PKMRAU941rB0MeN13/+r5M6lWBtBpLVHYzj0q2KyccgXh+u1rXymS1tjjbK9Sl49Atac=" target="_blank" style="color:blue; text-decoration:underline"><span style="color:rgb(12,0,255)">www.guralp.com/howtos/gps-wnro</span></a></span></span></span></span></td>
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<div><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:10.5pt"><span><span style="color:black">With best wishes,</span></span></span><br>
</span><br>
</div>
<div><span style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:10.5pt"><span><span style="color:black">The Güralp Team</span></span></span></span></div>
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<em><span style="font-size:8.5pt"><span><span style="color:rgb(76,76,76)"><span style="word-wrap:break-word!important">Güralp makes no warranty, representation or guarantee regarding the information contained herein, the performance of its products (which can
be dependent on their use and operational environment) or the suitability of products for any particular purpose. In the interests of continual improvement with respect to design, reliability, function or otherwise, all product specifications and data are
subject to change </span></span></span></span></em><em><span style="font-size:8.5pt"><span><span style="color:rgb(76,76,76)"><span style="word-wrap:break-word!important">without prior notice.</span></span></span></span></em></span></td>
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Confidentiality Notice: This email is confidential and may be legally privileged. It is intended only for use of the named recipient. If you are not the intended recipient of this email and its attachments, you must take no action based upon them, nor must
you copy or show them to anyone. Please notify us immediately and then delete this document. Internet communications are not secure and therefore Güralp Systems Limited does not accept legal responsibility for the contents of this message. If you do not wish
to correspond by email, please write or telephone us instead. </p>
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Guralp Systems Limited is a company registered in England and Wales. Registration number: 2199239. Registered Office: 3 Midas House, Calleva Park, Aldermaston, Reading, RG7 8EA
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