Navigation Systems and Radar Services

Objective

Upon completion of this lesson, the CFI candidate will demonstrate the ability to teach navigation systems and radar services to a helicopter student pilot. The candidate will exhibit comprehensive knowledge of ground-based and satellite-based navigation systems, radar services, and transponder operations while demonstrating effective instructional techniques. Performance will meet the standards outlined in ACS task HI.III.G.

Content

Ground-Based Navigation Systems (HI.III.G.K1)

Navigation begins with understanding where you are, where you’re going, and how to get there safely. Ground-based navigation systems provide the foundational infrastructure for instrument navigation.

VHF Omnidirectional Range (VOR)

• Identification: Always identify the station using Morse code identifier or voice announcement
• Orientation: VOR provides magnetic bearing FROM the station (radial)
• Course determination: OBS setting determines desired course
• Equipment: VOR receiver, OBS, CDI, TO-FROM flag
• Tests: VOR accuracy checks required per 14 CFR 91.171 (±4° for ground check, ±6° for airborne check)
• Regulations: 14 CFR 91.171 requires checks every 30 days for IFR flight
• Interference: Mountains, buildings, atmospheric conditions can affect signal quality
• Appropriate use: Line-of-sight limitations apply—higher altitude extends range
• Signal integrity: Check flag positions, listen for identifier, verify reasonable indications

Non-Directional Beacon (NDB) and Automatic Direction Finder (ADF)

• Provides bearing TO the station
• Subject to atmospheric interference, especially at dawn/dusk
• Requires station identification and bearing interpretation
• Useful for position fixing when crossed with other nav sources

Distance Measuring Equipment (DME)

• Provides slant-range distance to station
• Operates on line-of-sight principles
• Essential for determining position along a radial

Satellite-Based Navigation (HI.III.G.K2)

The Global Positioning System represents the evolution of navigation technology, offering unprecedented accuracy and capability.

GPS Equipment and Operation

• Minimum 24 satellites in constellation
• Requires four satellites for 3D position fix
• Provides latitude, longitude, altitude, and time
• Various receiver types: panel-mount, portable, integrated systems

Regulations and Authorized Use

• 14 CFR 91.205 specifies equipment requirements
• TSO-C129, TSO-C145, TSO-C146 approval standards
• Database currency requirements (28-day cycle for approach-capable units)
• Primary vs. supplemental navigation determination

Database Management

• Navigation database updates every 28 days
• Obstacle database updates
• Terrain database considerations
• Out-of-date database limitations

Receiver Autonomous Integrity Monitoring (RAIM)

• Self-monitoring capability of GPS receiver
• Requires minimum five satellites for RAIM capability
• RAIM prediction tools available for flight planning
• Loss of RAIM requires alternative navigation method

Radar Services for VFR Aircraft (HI.III.G.K3)

Radar services enhance flight safety through improved traffic separation and navigation assistance.

Types of Radar Services

• Basic radar services: safety alerts, traffic advisories, limited vectoring
• Traffic advisory services in terminal areas
• Class B, C, and D airspace services
• Flight following services

Equipment Requirements

• Mode C transponder required in most controlled airspace
• Two-way radio communication
• ADS-B Out equipment where required

Available Services

• Traffic advisories using clock positions and relative altitude
• Safety alerts for terrain or obstacles
• Navigation assistance when requested and workload permits
• Weather information and updates

Transponder and ADS-B (HI.III.G.K4)

Modern surveillance systems rely on aircraft-transmitted information for traffic separation and control.

Mode A (Identification)

• Four-digit squawk code assignment
• Standard codes: 1200 VFR, 7500 hijack, 7600 radio failure, 7700 emergency

Mode C (Altitude Reporting)

• Automatic altitude transmission
• Altitude encoder required
• Required in most controlled airspace per 14 CFR 91.215

Mode S (Enhanced)

• Enhanced surveillance capabilities
• Aircraft identification transmission
• Data link communications capability

ADS-B (Automatic Dependent Surveillance-Broadcast)

• GPS-based surveillance system
• ADS-B Out required in controlled airspace per 14 CFR 91.225
• Provides traffic and weather information through ADS-B In
• 1090 MHz and 978 MHz frequencies

Risk Management

Automated Systems Management (HI.III.G.R1) Understanding automation limitations prevents over-reliance and maintains pilot proficiency. Always maintain manual navigation skills as backup. Program GPS carefully and verify waypoint sequence before flight. Monitor system performance continuously and be prepared for manual reversion.

Task Prioritization and Situational Awareness (HI.III.G.R2) Navigation system operation must never compromise aircraft control. Establish priorities: aviate first, navigate second, communicate third. Brief passengers on workload-intensive phases. Use sterile cockpit procedures during critical navigation tasks.

Navigation System Limitations (HI.III.G.R3) Each system has specific limitations that must be understood and communicated. VOR accuracy decreases with distance and altitude constraints. GPS requires satellite geometry and signal integrity. Portable GPS units may not meet certification standards for certain operations.

Signal Loss Management (HI.III.G.R4) Prepare for navigation system failures through backup planning. Carry current charts and maintain pilotage skills. Know nearest airports and alternate routes. Practice manual navigation techniques regularly. Brief procedures for various failure scenarios.

Electronic Flight Bag Considerations (HI.III.G.R5) EFB systems enhance capability but introduce new risks. Ensure backup power and alternative charts. Understand software limitations and update requirements. Maintain proficiency with paper charts and traditional navigation methods.

Schedule

Equipment

Required References

• FAA-H-8083-15 Instrument Flying Handbook
• FAA-H-8083-25 Pilot’s Handbook of Aeronautical Knowledge
• AIM (Aeronautical Information Manual)
• 14 CFR Parts 61, 91
• Current sectional chart
• Current IFR en route chart

Materials and Visual Aids

• VOR receiver with OBS and CDI
• GPS receiver (panel-mount or portable)
• Transponder unit
• ADS-B display unit (if available)
• Navigation plotting tools
• Whiteboard and markers
• PowerPoint presentation on navigation systems
• Sample navigation log

Instructor Actions

The CFI candidate will demonstrate the ability to effectively teach navigation systems by:

1. Explaining ground-based navigation concepts using actual VOR receiver, demonstrating station identification, radial interpretation, and course tracking while relating concepts to real-world navigation scenarios

2. Operating GPS equipment while explaining satellite constellation requirements, database currency, and RAIM functionality, showing practical button sequences and menu navigation

3. Demonstrating radar communication procedures using realistic ATC scenarios, emphasizing proper phraseology and traffic advisory acknowledgment techniques

4. Showing transponder operation including code setting, mode selection, and ADS-B functionality while explaining regulatory requirements and operational considerations

5. Teaching risk management through scenario-based discussions, helping students identify potential failure modes and appropriate responses

6. Guiding practical exercises where students use navigation equipment to determine position, track courses, and communicate with ATC services

7. Providing effective feedback on student performance while maintaining appropriate learning environment and addressing misconceptions promptly

Student Actions

The student (simulated or actual) will:

1. Actively participate in navigation system identification and operation exercises

2. Demonstrate understanding by correctly identifying navigation equipment components and explaining their functions

3. Practice communication procedures using appropriate phraseology for radar services and traffic advisories

4. Work through scenarios involving navigation system failures and backup procedures

5. Ask relevant questions about equipment limitations, regulatory requirements, and operational considerations

6. Complete practical exercises showing competency in position determination and course tracking

7. Show evidence of learning through accurate responses to instructor questions and scenario-based problems

Completion Standards

The CFI candidate successfully completes this lesson when they demonstrate the ability to teach navigation systems and radar services effectively, meeting ACS standard HI.III.G. Specific completion criteria include:

Knowledge Demonstration

• Accurately explains ground-based navigation system components, operation, and limitations including identification procedures and accuracy requirements
• Clearly describes satellite navigation technology, regulatory requirements, database management, and RAIM functionality
• Comprehensively covers radar services available to VFR aircraft including communication procedures and service limitations
• Thoroughly explains transponder modes and ADS-B requirements with current regulatory compliance standards

Risk Management Instruction

• Effectively teaches automated system management techniques and backup procedures
• Clearly addresses task prioritization and situational awareness maintenance during navigation tasks
• Comprehensively covers navigation system limitations and failure recognition
• Adequately explains EFB considerations and backup planning requirements

Practical Skills Instruction

• Successfully demonstrates airborne electronic navigation system use while teaching operation techniques
• Accurately teaches position determination methods using available navigation systems
• Effectively instructs course interception and tracking techniques with appropriate tolerance standards
• Clearly explains station and waypoint passage recognition indicators
• Properly demonstrates radar service communication procedures using standard phraseology

Teaching Effectiveness

• Uses appropriate instructional techniques including demonstration, guided practice, and scenario-based learning
• Provides clear, accurate explanations adapted to student experience level
• Maintains student engagement through interactive teaching methods
• Offers timely, specific feedback on student performance
• Creates realistic learning scenarios that reinforce safety concepts and practical application

The instruction must reflect current regulations, ACS standards, and best practices for helicopter flight instruction, demonstrating the candidate’s readiness to teach navigation systems safely and effectively.