At its March 15 Open Meeting, the FCC intends to vote on a Fourth Further Notice of Proposed Rulemaking (“FNPRM”) in its Wireless E911 Location Accuracy Requirements proceeding that would consider adoption of a vertical, or z-axis, location accuracy metric. Currently there is no z-axis metric, despite proposals by the Commission going back to as early as 2014. The FNPRM, if adopted, would propose a z-axis metric of +/- 3 meters relative to the handset for 80 percent of wireless E911 calls, the same metric proposed in a Third Further Notice in the proceeding. The Commission deferred promulgation of a specific metric for lack of sufficient test data in a 2015 order that established benchmarks and timetables for the deployment of z-axis in the top 50 Cellular Market Areas (“CMAs”).

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