<div dir="ltr"><div dir="ltr">Three meters is three floors of resolution, depending on whether the person is standing or laying on the ground.<div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 27, 2021 at 1:34 PM Mark Lindsey <<a href="mailto:lindsey@e-c-group.com">lindsey@e-c-group.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;">In the top 25 cellular market areas, nationwide cell phone providers are already required to provide Z-axis (elevation) data within 3 meters for 80% of calls [for compatible devices]. The requirements increase each year; by 2026, <i>all</i> cellular providers are required to provide z-axis precision for dispatchable location of +/- 3 meters everywhere in the US. <div><br></div><div>This is all in addition to providing +/- 50 meter horizontal (x, y axis, also known as latitude and longitude) precision for 911 calls.<div><div><br></div><div><a href="https://www.fcc.gov/public-safety-and-homeland-security/policy-and-licensing-division/911-services/general/location-accuracy-indoor-benchmarks" target="_blank">https://www.fcc.gov/public-safety-and-homeland-security/policy-and-licensing-division/911-services/general/location-accuracy-indoor-benchmarks</a></div><div><br><div><br><div>
<div dir="auto" style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><div dir="auto" style="letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><div dir="auto" style="letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><div dir="auto" style="text-align:start;text-indent:0px"><div><div dir="auto" style="overflow-wrap: break-word;"><div dir="auto" style="overflow-wrap: break-word;"><div dir="auto" style="overflow-wrap: break-word;"><div dir="auto" style="overflow-wrap: break-word;"><div dir="auto" style="overflow-wrap: break-word;"><div dir="auto" style="overflow-wrap: break-word;"><div dir="auto" style="overflow-wrap: break-word;"><div dir="auto" style="overflow-wrap: break-word;"><div dir="auto" style="overflow-wrap: break-word;"><div style="overflow-wrap: break-word;"><div style="overflow-wrap: break-word;"><div><div style="color:rgb(0,0,0);letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><font><span style="color:rgb(0,68,121);font-size:9px;font-family:Helvetica"><font face="Arial Black" style="line-height:normal"><b>Mark R Lindsey, SMTS</b></font></span><span style="font-size:9px;font-family:"Arial Black""><span style="font-size:13px"><font color="#794800"> <span style="font-size:16px">|</span> </font></span></span><span style="color:rgb(0,68,121);font-size:9px;font-family:"Arial Black"">+1-229-316-0013</span><font color="#794800"><span style="font-size:9px;font-family:"Arial Black""><span style="font-size:13px"> </span></span><span style="font-size:9px;font-family:"Arial Black""><span style="font-size:13px"><span style="font-size:16px">|</span></span></span><span style="font-size:9px;font-family:"Arial Black""><span style="font-size:13px"> </span></span></font><span style="font-size:9px;font-family:"Arial Black""><font color="#004479"><a href="mailto:mark@ecg.co" target="_blank">mark@ecg.co</a></font><span style="font-size:13px"><font color="#794800"> </font></span></span><span style="font-size:9px;font-family:"Arial Black""><span style="font-size:13px"><span style="font-size:16px"><font color="#794800">|</font></span></span></span><font face="Arial Black"><span style="font-size:9px"><b><font color="#794800"> </font><font color="#004479" style="color:rgb(0,68,121)"><a href="https://ecg.co/lindsey/" style="color:rgb(0,68,121)" target="_blank">https://ecg.co/lindsey/</a></font></b></span></font></font></div></div></div></div></div></div></div></div></div></div></div></div><br></div><br></div></div><br></div><br></div><br></div><br><br>
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<div><br><blockquote type="cite"><div>On Sep 27, 2021, at 4:07 PM, Carlos Alvarez <<a href="mailto:caalvarez@gmail.com" target="_blank">caalvarez@gmail.com</a>> wrote:</div><br><div><div dir="ltr">They probably don't, and I don't think they are covered by the same law/requirements. Also, they have far more schills(COUGH) I mean lobbyists in congress.<div><br></div><div>FLOOR could be determined by AP lists, probably. Maybe. Specific office seems impossible currently.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 27, 2021 at 1:05 PM Alex Balashov via VoiceOps <<a href="mailto:voiceops@voiceops.org" target="_blank">voiceops@voiceops.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">And how do the cell phone operators know what floor you’re on?<br><br><div dir="ltr">—<div>Sent from mobile, with due apologies for brevity and errors.</div></div><div dir="ltr"><br><blockquote type="cite">On Sep 27, 2021, at 3:49 PM, Carlos Alvarez <<a href="mailto:caalvarez@gmail.com" target="_blank">caalvarez@gmail.com</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">It used to be, then the whole Ray Baum thing, and now it's not. Short story: 911 call failed to identify the specific floor/office, person died. Now you have to provide enough info for a first responder to reach a person without help, which also means opening main doors if needed. There's simply no way that a laptop will give that specificity. Will it be sufficient to say that they are near the AP on the third floor southwest corner? The letter of the law seems to say "no."<div><br><div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 27, 2021 at 12:40 PM Alex Balashov via VoiceOps <<a href="mailto:voiceops@voiceops.org" target="_blank">voiceops@voiceops.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I wonder if doing GeoIP via a commercial database like MaxMind—and we all know how perfect a location mechanism that is—could be construed as a sufficient “best effort” in this case.<br>
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> On Sep 27, 2021, at 3:28 PM, Carlos Alvarez <<a href="mailto:caalvarez@gmail.com" target="_blank">caalvarez@gmail.com</a>> wrote:<br>
> <br>
> Ours doesn't, but that's a good idea to share with the vendor. But in most cases, people are using the softphone on a laptop and there's no native phone app, nor a GPS, nor any other location info other than proximate wi-fi networks.<br>
> <br>
> I can see no feasible way to meet the letter of the law, and hate to be depending on the good graces of a bureaucrat to know that it's an impossible task.<br>
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-- <br>
Alex Balashov | Principal | Evariste Systems LLC<br>
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Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)<br>
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