Where Are We?: Examining Positioning, Navigation, and Timing Capabilities in the United States

Commerce, Space, and Science NominationsHouse Energy and Commerce Subcommittee on Communications and Technology · June 4, 2026 · 119th Congress
The Subcommittee on Communications and Technology held this hearing to examine the current state and vulnerabilities of GPS-based positioning, navigation, and timing (PNT) services and to hear from industry witnesses about complementary and backup technologies under consideration, including terrestrial broadcast-based systems and 5G-based systems. Begins at ▶ 0:11:13
Transcript
Highlights

Title

GPS resilience and complementary backup navigation and timing systems

Purpose

The Subcommittee on Communications and Technology held this hearing to examine the current state and vulnerabilities of GPS-based positioning, navigation, and timing (PNT) services and to hear from industry witnesses about complementary and backup technologies under consideration, including terrestrial broadcast-based systems and 5G-based systems. Members focused heavily on a pending FCC proceeding over NextNav's proposal to reconfigure the lower 900 MHz band, weighing GPS resilience and national security benefits against interference concerns raised by utilities, public safety, agriculture, and unlicensed-device users. Witnesses included representatives from the GPS Innovation Alliance, National Association of Broadcasters, NextNav, Public Knowledge, and the Consumer Technology Association. Begins at▶ 0:11:13

Who spoke

• Chairman Richard Hudson (R-NC)▶ 0:11:13: Opened the hearing describing GPS's military origins and civilian expansion, cited a Royal Air Force jet losing GPS to suspected Russian jamming two weeks earlier▶ 0:13:30, and noted the FCC's March notice of inquiry on complementary PNT▶ 0:14:51; later questioned witnesses on the 900 MHz band reorganization▶ 0:54:20.

• Ranking Member Doris Matsui (D-CA)▶ 0:15:48: Stressed GPS's role beyond navigation and the need to vet backup technologies for public safety▶ 0:18:36; later got Dyer, Feld, and Grossman to state their organizations believe NextNav's proposal raises interference concerns and has not adequately addressed them▶ 0:59:16▶ 0:59:44.

• Chairman Brett Guthrie (R-KY), Full Committee▶ 0:19:19: Argued spectrum decisions should be made by expert agencies (FCC/NTIA) via existing processes like IRAC, not Congress▶ 0:20:40; polled witnesses on whether Congress should set spectrum policy via appropriations, getting mostly "no" responses▶ 1:03:48.

• Ranking Member Frank Pallone (D-NJ), Full Committee▶ 0:19:55: Highlighted GPS privacy risks and the need for consumer protections in any PNT advancement▶ 0:22:22; pressed Sorond on whether NextNav's 5G solution must use the same spectrum as its existing services▶ 0:59:56.

• Lisa Dyer, GPS Innovation Alliance▶ 0:27:31: Testified GPS has had zero system-wide outages since 1995 with 32 satellites and 99.99% signal availability▶ 0:28:43▶ 0:29:06; warned 8 of 32 satellites operate on a single string one failure from non-operational▶ 0:29:57; said China launched an entire third-generation GPS-equivalent constellation in three years versus one US launch▶ 1:24:06; noted it took the FCC and FBI seven days to locate a jammer in Westminster, Colorado▶ 1:56:32.

• Sam Matheny, NAB/Broadcast Positioning System (BPS)▶ 0:32:37: Announced the new independent company "Market Solutions" to deploy BPS, a terrestrial timing/positioning system riding on ATSC 3.0 broadcast infrastructure▶ 0:33:00; cited a 2025 NIST finding that BPS time transfer is comparable to or better than GPS▶ 0:35:49; described a DOT-funded field trial with Dominion Energy at an East Coast substation▶ 0:36:16; said BPS reaches over 75% of the US population via 80 ATSC 3.0 markets and could be fully deployed within a year▶ 1:59:11.

• Mariam Sorond, NextNav▶ 0:38:06: Argued the US, unlike China and Russia, has no ground-based GPS backup▶ 0:40:22; said NextNav's Pinnacle vertical-location service operates in over 4,400 US cities and serves FirstNet's Z-axis need▶ 0:40:48; defended its 900 MHz petition as a "modernization" of existing licensed spectrum with no reported interference▶ 1:22:19; said its 5G network covers over 96% of the population▶ 1:02:03.

• Harold Feld, Public Knowledge▶ 0:42:51: Called GPS a public good like roads or clean water that must not be privatized▶ 0:43:14; sharply criticized both BPS and NextNav's proposals, saying NextNav wants "a multibillion dollar infusion of new spectrum rights" for free while threatening billions in existing consumer products▶ 0:46:57▶ 0:47:24; later called the NextNav petition "not a modernization... a land grab"▶ 2:13:29.

• J. David Grossman, Consumer Technology Association (CTA)▶ 0:47:55: Recommended GPS modernization, a market-driven approach to complementary PNT, and protecting the lower 900 MHz band, citing use by first responders, medical alert pendants, RFID, and farmers▶ 0:49:47▶ 0:50:15; estimated $5–7.2 billion in RFID-system risk from interference at ports▶ 2:13:01.

• Rep. Kirsten Kirsten (unclear) — not present; correction: *(none — omitted)*

• Rep. Rick Allen (R-GA), Vice Chair▶ 1:13:00: Asked witnesses about GPS/PNT importance to first responders after Hurricane Helene▶ 1:13:33 and about the NAB-Dominion Energy NIST pilot▶ 1:16:51.

• Rep. Yvette Clarke (D-NY)▶ 1:18:15: Warned against corporate giveaways and "digital redlining" from a rushed 900 MHz reconfiguration harming baby monitors, smoke alarms, and medical devices▶ 1:20:29; pressed Sorond on unlicensed-user impacts▶ 1:21:52.

• Rep. Bob Latta (R-OH)▶ 1:23:42: Asked Dyer about China's dual-orbit satellite advantage▶ 1:24:06 and why GPS's L5 military anti-jamming gains haven't extended to civil signals▶ 1:25:31; discussed precision agriculture with Grossman▶ 1:26:35.

• Rep. Raul Ruiz (D-CA)▶ 1:28:43: Focused on rural emergency response and tribal lands, asking Grossman about GPS outages harming ambulances in areas hours from hospitals▶ 1:30:02 and Dyer about tribal PNT resilience planning▶ 1:31:46.

• Rep. Morgan Griffith (R-VA)▶ 1:34:03: Questioned Dyer on low-Earth-orbit PNT systems like Iridium, TrustPoint, and Xona versus Chinese systems▶ 1:34:35; pressed Grossman on unverified NextNav interference test videos▶ 1:37:24.

• Rep. Debbie Dingell (D-MI)▶ 1:39:20: Asked Feld about consequences of a GPS disruption without backups, warning of cascading failures▶ 1:41:34; asked Grossman about autonomous vehicle PNT needs▶ 1:42:54.

• Rep. Gus Bilirakis (R-FL)▶ 1:44:56: Discussed a Tampa-based autonomous-vehicle positioning company▶ 1:45:20 and asked Matheny about BPS resilience during hurricane season▶ 1:48:01.

• Rep. Scott Peters (D-CA)▶ 1:49:32: Asked Dyer whether Europe's Galileo system faces similar jamming/spoofing as GPS, confirming it does, along with China's BeiDou and Russia's GLONASS▶ 1:50:27; raised utility-band interference cost concerns with Grossman▶ 1:53:10.

• Rep. Buddy Carter (R-GA)▶ 1:54:59: Advocated a layered PNT approach; asked Dyer for Congress's most urgent PNT vulnerability, which she said was jamming/spoofing enforcement▶ 1:56:12; asked Matheny about BPS's national-security emergency-response role▶ 1:57:31.

• Rep. Jennifer McClellan (D-VA)▶ 2:00:05: Credited Dr. Gladys West's mathematical work underlying GPS▶ 2:00:05; asked Feld what FCC should weigh for first-responder PNT alternatives▶ 2:02:03 and Grossman/Dyer about industry cybersecurity investment▶ 2:03:39.

• Rep. William Timmons (R-SC)▶ 2:05:44: Pressed Sorond on the reasoning behind NextNav's 900 MHz petition and the volume of opposition it has drawn▶ 2:08:00; asked why a less disruptive alternative couldn't be pursued▶ 2:10:06.

• Rep. Rob Menendez (D-NJ)▶ 2:11:18: Focused on tolling and port infrastructure risk in his district, asking Grossman about lower-900 MHz interference costs▶ 2:13:01 and Feld about the "land grab" characterization of NextNav's petition▶ 2:13:29; noted NextNav's stock rose alongside Chairman Carr's FCC tenure and Project 2025▶ 2:15:21.

• Rep. Erin Houchin (R-IN)▶ 2:16:45: Cited GPS outages costing over $1 billion a day, with a 30-day planting-season disruption potentially costing $45 billion▶ 2:17:43; asked Matheny about 2024 solar-storm impacts pausing planting▶ 2:18:43.

• Rep. Mike Carey (R-OH)▶ 2:21:45: Used a movie analogy to ask Dyer and Matheny about redundancy's importance▶ 2:23:04; asked Grossman and Feld whether interference disputes can be resolved through the FCC process, with Feld disagreeing given the scale of NextNav's proposed rule changes▶ 2:26:22.

• Rep. Julia Letlow (R-LA)▶ 2:27:23: Asked Matheny about BPS deployment timeline, receiver availability, rural coverage, and vulnerabilities compared to GPS▶ 2:27:52▶ 2:31:53.

• Rep. Darren Soto (D-FL)▶ 2:32:19: Detailed central Florida's reliance on the 900 MHz band for aviation, retail, agriculture, and tolling▶ 2:32:42; asked all witnesses for their ideal PNT redundancy mix▶ 2:34:25.

• Rep. Kevin Kiley (R-CA)▶ 2:37:56: A pilot himself, questioned Matheny on BPS's limited offshore range for aviation use▶ 2:38:51 and Sorond on 5G's short range at high altitude for aircraft▶ 2:41:14.

• Rep. Robin Kelly (D-IL)▶ 2:43:10: Asked Sorond how NextNav would protect farm equipment from 900 MHz interference▶ 2:44:48 and Feld what guardrails FCC should impose before approving NextNav's proposal▶ 2:45:58.

• Rep. Nanette Barragán (D-CA)▶ 2:48:23: Focused on Port of Los Angeles logistics, asking Grossman about GPS disruption risks to supply chains and RFID tags▶ 2:50:42; asked Feld about keeping PNT technology accessible to non-early-adopter communities▶ 2:52:02.

• Rep. August Pfluger (R-TX)▶ 2:53:40: A retired Air Force officer, asked Dyer about Middle East jamming/spoofing as a defensive tactic against drones▶ 2:53:40 and about prioritizing GPS III satellites and the L5 aviation signal▶ 2:54:31.

• Rep. Rob Bresnahan (R-PA)▶ 2:58:48: Highlighted precision agriculture in his Pennsylvania district (drones, precision spraying, aerial seeding) and asked Grossman and Matheny about GPS disruption effects on farming and BPS's rural precision-agriculture accuracy (3.38m cited)▶ 3:02:54.

• Rep. Kevin Mullin (D-CA)▶ 3:04:16: Discussed his LEO PNT bill (H.R. 4344, Resilient LEO Act) and Xona Space Systems in his district▶ 3:05:39; asked Feld about risks of a fully privatized, tiered PNT system and wireless emergency alert geo-targeting failures during the LA fires▶ 3:08:43.

• Rep. Craig Goldman (R-TX)▶ 3:09:40: Asked Dyer about recurring GPS disruptions at DFW Airport▶ 3:09:40 and Sorond about NextNav's assessment of critical-infrastructure devices in the 900 MHz band▶ 3:11:32.

• Rep. Kat Cammack (R-FL)▶ 3:13:49: Pressed Sorond on independent testing and outreach to public-safety and rural first-responder organizations regarding interference concerns▶ 3:14:48▶ 3:16:34; questioned why existing 900 MHz users should bear risk given alternative technologies exist▶ 3:18:11.

Key moments

• Dyer testified GPS has had zero system-wide outages since becoming operational in 1995, with 32 satellites (eight above the required minimum) and 99.99% FAA-reported signal availability, but that eight satellites operate on a single string one failure from non-operational▶ 0:28:43▶ 0:29:06▶ 0:29:31.

• Sorond stated the US has no ground-based GPS backup while China and Russia have built them, framing NextNav's proposal as filling that gap▶ 0:40:22.

• Matsui had Dyer, Feld, and Grossman each confirm on the record that their organizations believe NextNav's 900 MHz proposal raises interference concerns and has not adequately addressed them with technical data▶ 0:59:16▶ 0:59:44.

• Feld argued NextNav's petition amounts to a "land grab," seeking billions of dollars in spectrum rights with no public-interest obligations in return, and compared it to the "disaster" of the 800 MHz Nextel rebanding that took a decade and billions to resolve▶ 0:46:57▶ 2:26:22▶ 2:46:38.

• Grossman said unverified NextNav test videos on RFID and smoke-detector coexistence were only one minute long with no accompanying technical data, and estimated $5–7.2 billion in RFID-system risk at ports if interference occurred▶ 1:37:24▶ 2:13:01.

• Matheny announced NAB's launch of an independent company, "Market Solutions," to deploy the Broadcast Positioning System, citing a 2025 NIST finding that BPS time transfer is comparable to or better than GPS and a DOT-funded field trial with Dominion Energy▶ 0:33:00▶ 0:35:49▶ 0:36:16.

• Rep. Kiley, a pilot, challenged both Matheny and Sorond on the range limits of BPS (roughly 35–100 miles offshore) and 5G-based NextNav signals at cruising altitude, prompting both witnesses to acknowledge a layered architecture including satellites is still required for aviation▶ 2:38:51▶ 2:41:14.

• Rep. Menendez noted NextNav's stock price rose sharply alongside Chairman Brendan Carr's FCC tenure and Project 2025's emphasis on GPS resilience, questioning whether market sentiment reflected anticipated regulatory favor▶ 2:15:21.

• Dyer disclosed it took the FCC and FBI seven days to locate an inadvertent jammer near Westminster, Colorado▶ 1:56:32.

• Multiple members (Clarke, Kelly, Barragán, Cammack) raised concerns that reconfiguring the lower 900 MHz band could disrupt baby monitors, smoke alarms, medical alert pendants, RFID tags, and farm/utility sensors relied on by hundreds of millions of unlicensed devices▶ 1:20:29▶ 2:44:48▶ 2:50:42.

Metadata

CommitteeHouse Energy and Commerce Subcommittee on Communications and Technology
Chamber / CongressHouse · 119th Congress
DateJune 4, 2026
TypeHearing
Witnesses
J. Grossman — Vice President, Policy & Regulatory Affairs, Consumer Technology Association
Ms. Lisa Dyer — Executive Director, GPS Innovation Alliance (GPSIA)
Ms. Mariam Sorond — Board Chair and Chief Executive Officer, NextNav
Mr. Harold Feld — Senior Vice President, Public Knowledge
Mr. Sam Matheny — Executive Vice President, Broadcast Positioning System, National Association of Broadcasters
Videoyoutube
Transcript437 caption blocks · 29,372 words · 3:20:14 runtime
EventCongress.gov 119351