{"abstract":"The purpose of this notice is to seek comment from the public and industry regarding plans by the United States Air Force to broadcast pre-operational L2C and L5 civil navigation (CNAV) messages from certain Global Positioning System (GPS) satellites beginning in April 2014. These messages will be formatted in accordance with Interface Specifications IS-GPS-200G and IS-GPS-705C, each dated 31 Jan 2013. However, a pre-operational signal means the availability and other characteristics of the broadcast signal may not comply with all requirements of the relevant Interface Specifications and should be employed at the users' own risk. The Department of Transportation seeks comments on: (a) The benefits, risks, or issues to users from this plan, including comments on the appropriate timeline for broadcasting pre-operational CNAV messages. Comments are requested from industry on: (b) the receiver development benefits and other intended uses of pre-operational signals, and (c) the benefits and potential impacts to users of continuous pre-operational CNAV messages with L2C and L5 signals set healthy.","action":"Notice; request for public comments.","agencies":[{"raw_name":"DEPARTMENT OF TRANSPORTATION","name":"Transportation Department","id":492,"url":"https://www.federalregister.gov/agencies/transportation-department","json_url":"https://www.federalregister.gov/api/v1/agencies/492","parent_id":null,"slug":"transportation-department"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2014/03/05/2014-04856.html","cfr_references":[],"citation":"79 FR 12563","comment_url":null,"comments_close_on":"2014-04-04","correction_of":null,"corrections":[],"dates":"Submit comments on or before April 4, 2014.","disposition_notes":null,"docket_ids":[],"dockets":[],"document_number":"2014-04856","effective_on":null,"end_page":12564,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2014/03/05/2014-04856.xml","html_url":"https://www.federalregister.gov/documents/2014/03/05/2014-04856/global-positioning-system-pre-operational-civil-navigation-message-continuous-broadcast","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2014-04856?publication_date=2014-03-05","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2014-03-05/2014-04856/mods.xml","not_received_for_publication":null,"page_length":2,"page_views":{"count":1368,"last_updated":"2026-07-28 04:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2014-03-05/pdf/2014-04856.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2014-04856.pdf?1393941418","publication_date":"2014-03-05","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2014/03/05/2014-04856.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2014-04-12T05:06:37Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":12563,"subtype":null,"title":"Global Positioning System Pre-Operational Civil Navigation; Message Continuous Broadcast","toc_doc":"Global Positioning System Pre-Operational Civil Navigation Message Continuous Broadcast","toc_subject":null,"topics":[],"type":"Notice","volume":79}