Flight Instructor for Rotorcraft Category Helicopter Rating › II. Technical Subject Areas › Task I. Navigation Systems and Radar Services

HI.II.I.R4

Risk management

Loss of a navigation signal.

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Pilot's Handbook of Aeronautical Knowledge p. 16-33
Chapter 16: Navigation › RAIM Capability › Tips for Using GPS for VFR Operations
Consequently, signal loss may occur in certain situations where aircraft-satellite geometry causes a loss of navigation signal. These losses, coupled with a lack of RAIM capability, could present erroneous position and navigation information with no warning to the pilot ... While a hand-held GPS receiver can provide excellent navigation capability to VFR pilots, be prepared for intermittent loss of navigation signal, possibly with no RAIM warning to the pilot. If mounting the receiver in the aircraft, be sure…
Pilot's Handbook of Aeronautical Knowledge p. 16-32
Chapter 16: Navigation › Ground-Based Navigation › RAIM Capability
used, some portion of the aircraft may block the view of the antenna increasing the possibility of losing navigation signal. This is especially true in the case of hand-held receivers. The use of hand-held receivers for VFR operations ... limited by aircraft structure for optimal reception of available satellites. Consequently, signal loss may occur in certain situations where aircraft-satellite geometry causes a loss of navigation signal. These losses, coupled with a lack of RAIM capability, could present erroneous…
Aeronautical Information Manual p. 1-1-23
Chapter 1. Air Navigation › Section 1. Navigation Aids › 1-1-17. Global Positioning System (GPS)
provided with the satellites. Antennae not providing a clear view have a greater opportunity to lose the satellite navigational signal. This is especially true in the case of hand-held GPS receivers. Typically, suction cups are used to place ... clear view of all available satellites. Consequently, signal losses may occur due to aircraft structure blocking satellite signals, causing a loss of navigation capability. These losses, coupled with a lack of RAIM capability, could present erroneous position and navigation information…
Aeronautical Information Manual p. 1-1-37
Chapter 1. Air Navigation › Section 1. Navigation Aids › 1-1-18. Wide Area Augmentation System (WAAS)
EXAMPLE-For unscheduled loss of signal or service, an example NOTAM is…
Aeronautical Information Manual p. 1-2-11
Chapter 1. Air Navigation › Section 2. Performance-Based Navigation (PBN) and Area Navigation (RNAV) › 1-2-4. Recognizing, Mitigating, and Adapting to GPS Jamming and/or Spoofing
valid satellite signals. NOTE-The U.S. government regularly conducts GPS tests, training activities, and exercises that interfere with GPS signals. These events are geographically limited, coordinated, scheduled, and advertised via GPS and/or WAAS NOTAMS. Operators of GPS aircraft should always ... which include, but are not limited to: 1. Inability to use GPS for navigation. 2. Inability to use hybrid GPS inertial systems for navigation. 3. Loss of, or degraded, performance-based navigation (PBN) capability (e.g., inability to fly required navigation…