Correct: D)
Explanation: GPS signals are microwave transmissions from orbiting satellites that require a clear line of sight between the satellite and the receiver. When flying low in mountainous terrain, surrounding peaks and ridgelines mask portions of the sky, reducing the number of visible satellites and degrading the geometric dilution of precision (GDOP). This can lead to inaccurate position fixes or complete signal loss. Option A (cloud layers) does not affect microwave GPS signals. Option B (thunderstorms) do not block GPS signals. Option C (heading changes) have no effect on satellite signal reception.
Correct: D)
Explanation: True Course (TC) is calculated from Magnetic Course (MC) by accounting for magnetic declination. With easterly variation, magnetic north lies east of true north, so MC is larger than TC. The formula is TC = MC minus East variation: 225 degrees minus 5 degrees = 220 degrees. Option A ignores the variation entirely. Option B is incorrect because MC and variation are sufficient to calculate TC. Option C adds the variation instead of subtracting it, which would apply to westerly variation.
Correct: D)
Explanation: Using the radial and distance references to plot both positions on the Swiss ICAO chart — Gruyeres at 222 degrees/46 km from Bern and Lausanne at 051 degrees/52 km from Geneva — and measuring the true course between them with a protractor yields approximately 261 degrees (roughly west-southwest). Options A and B give headings too far to the northwest. Option C points east-northeast, which would be the reverse direction entirely.
Correct: C)
Explanation: VDF operates on VHF frequencies, which propagate in a quasi-optical (line-of-sight) manner. If the aircraft is flying too low, the curvature of the Earth or intervening terrain blocks the signal path between the aircraft and the ground station, resulting in weak or undetectable signals. Option A is irrelevant because transponders are not used for VDF bearings. Option B overstates atmospheric effects, which are negligible for VHF under normal conditions. Option D (defective radio) is possible but less likely than the geometric limitation described in option C.
Correct: A)
Explanation: The agonic line is a specific isogonic line along which the magnetic declination (variation) is exactly zero degrees — meaning true north and magnetic north are aligned. Along this line, a magnetic compass points directly to geographic north without any correction needed. Option B describes a region, not a line, and is not a recognized navigational term. Option C defines the broader category of isogonic lines, of which the agonic line is a special case. Option D describes local magnetic anomalies, not the agonic line.
Correct: B)
Explanation: To convert metres to feet, multiply by the conversion factor 3.2808 (since 1 metre = 3.2808 feet). Calculating: 4572 m multiplied by 3.2808 = 15,000 ft. This is a standard altitude conversion that aviation pilots should be able to perform quickly. Option A (1500 ft) and option D (1393 ft) are an order of magnitude too small. Option C (13,935 ft) results from an incorrect conversion factor.
Correct: D)
Explanation: Lines of longitude (meridians) converge toward the poles, so the distance between two degrees of longitude is greatest at the equator (60 NM or 111 km) and decreases to zero at the poles, following the cosine of the latitude. This is a fundamental property of the spherical coordinate system. Option A is wrong because longitude spacing varies with latitude. Option B incorrectly describes latitude: the distance between two degrees of latitude is approximately constant at 60 NM everywhere, not decreasing toward the poles. Option C makes the same error as A for longitude alone.
Correct: C)
Explanation: On a navigation chart, the course line is drawn relative to the chart's grid, which is oriented to geographic (true) north. Therefore, the value measured and marked on the chart is the True Course (TC) — the angle between true north and the intended track line. Magnetic heading (option B), true heading (option A), and compass heading (option D) all incorporate corrections for wind, magnetic variation, or compass deviation that are calculated separately during flight planning, not drawn on the chart itself.
Correct: C)
Explanation: If the aircraft drifts to the right, the wind has a component pushing from the left side. To counteract this drift and maintain the desired track, you must turn into the wind by increasing the heading value (turning the nose further to the right to establish a crab angle into the wind component). Option A is vague but could be interpreted as correct — however, option C is more precise in specifying the heading adjustment. Option B (flying more slowly) would actually increase the drift angle. Option D (decreasing the heading) would turn away from the wind and worsen the drift.
Correct: D)
Explanation: Lenzburg lies beneath the Zurich TMA structure. According to the Swiss ICAO chart, the lowest TMA sector in this area has its floor at 1700 m AMSL. Below this altitude, the airspace is uncontrolled (Class E or G), and gliders may fly without ATC notification or authorisation. Above 1700 m AMSL, you enter controlled airspace requiring a clearance. Options A and B are incorrect altitude values. Option C (4500 ft, approximately 1370 m) is below the actual limit and would unnecessarily restrict your flight.
Correct: C)
Explanation: In a Lambert conformal conic projection, the cone is placed over the globe so that meridians project as straight lines converging toward the apex (the pole), while parallels of latitude appear as concentric arcs (parallel curves) centered on the pole. This projection preserves angles (conformality), making it ideal for aeronautical charts. Option A describes a cylindrical projection like Mercator. Option B reverses the characteristics of meridians and parallels. Option D does not describe any standard cartographic projection.
Correct: D)
Explanation: On 10 June, Switzerland observes Central European Summer Time (CEST), which is UTC+2. Departure at 1030 LT (CEST) equals 0830 UTC. Adding 80 minutes of flight time: 0830 + 0080 = 0950 UTC. Option A (1050 UTC) appears to use UTC+1 instead of UTC+2. Option B (1350 UTC) adds the time difference instead of subtracting it. Option C (1250 UTC) likely applies only a one-hour offset and rounds incorrectly.
Correct: D)
Explanation: Bellechasse aerodrome (LSGE) is located west-northwest of Bern, near the town of Bellechasse in the canton of Fribourg. Plotting the position at 285 degrees/28 km from Bern on the Swiss ICAO chart yields coordinates of approximately 46 degrees 59 minutes N / 007 degrees 08 minutes E. Options B and C use South and West designations, which are impossible for locations in Switzerland (Northern Hemisphere, east of the Greenwich meridian). Option A places the aerodrome too far north and east.
Correct: C)
Explanation: The "POOR GPS COVERAGE" message indicates that the receiver cannot track enough satellites with adequate geometry for a reliable position fix. The most common cause during cross-country glider flights is terrain masking — flying in deep valleys or near steep mountain faces that block satellite signals from view. Option A (twilight effect) is not a recognized GPS phenomenon. Option B overstates how satellite repositioning works, as GPS receivers continuously update orbital data without manual intervention. Option D (thunderstorms) does not affect GPS microwave signals.
Correct: C)
Explanation: Deviation is the error in a magnetic compass caused by local magnetic fields from the aircraft's own metallic structure, electrical wiring, and electronic equipment. It varies with heading and is recorded on a deviation card in the cockpit. Option A (variation) and option B (declination) both refer to the angular difference between true north and magnetic north, which is a property of the Earth's magnetic field, not the aircraft. Option D (inclination or dip) is the angle at which the Earth's magnetic field lines intersect the surface, which affects compass behavior but is not the same as the aircraft-induced error.
Correct: D)
Explanation: This is a closed triangular cross-country route with three legs: Courtelary to Dittingen, Dittingen to Birrfeld, and Birrfeld back to Courtelary. Each position is plotted on the Swiss ICAO 1:500,000 chart using the given radial/distance references, and the leg distances are measured with a ruler. The sum of all three legs yields approximately 189 km. Option A (315 km) is far too long. Option B (97 km) accounts for only about half the route. Option C (210 km) overestimates by roughly 20 km.
Correct: B)
Explanation: Modern aviation GPS units allow pilots to change the display units (metres, feet, kilometres, nautical miles, etc.) through the device's settings menu (SETTING MODE). This is a simple user-accessible configuration change that does not require any maintenance intervention. Option A incorrectly suggests that a workshop visit is needed. Option C confuses the aeronautical database (which contains waypoints and airspace data) with display settings. Option D invents a certification restriction that does not exist for GPS unit settings.
Correct: D)
Explanation: To determine map scale, convert both measurements to the same unit: 10 km = 10,000 m = 1,000,000 cm. The ratio of map distance to real distance is 5 cm to 1,000,000 cm, which simplifies to 1 cm representing 200,000 cm, giving a scale of 1:200,000. Option A (1:100,000) would mean 5 cm = 5 km. Option B (1:20,000) would mean 5 cm = 1 km. Option C (1:500,000) would mean 5 cm = 25 km. Only 1:200,000 produces the correct 5 cm = 10 km relationship.
Correct: C)
Explanation: Over a difficult navigation area during a long approach, the most effective technique is to use time-based dead reckoning: monitor elapsed time with a time ruler (marking planned time checkpoints along the route) and confirm your position by identifying ground features as they appear, marking each verified position on the map. This combines time estimation with visual confirmation for maximum accuracy. Option A (orienting to north) is a basic step but alone does not solve navigation difficulties. Option B (monitoring the compass) maintains heading but provides no position information. Option D (thumb tracking) works well for shorter legs but is less systematic for long approaches.
Correct: C)
Explanation: In Switzerland, glider-to-glider communication frequencies are divided geographically. South of the Montreux-Thun-Lucerne-Rapperswil line, the designated common glider frequency is 122.475 MHz. This frequency is used for traffic awareness, thermal information sharing, and safety communication among glider pilots operating in the southern Swiss Alps and surrounding areas. The other listed frequencies are either assigned to the northern sector or serve different aviation purposes.
Correct: D)
Explanation: LS-R6 is a restricted area (the "R" stands for Restricted in Swiss airspace classification). When active, entry is prohibited for all aircraft except helicopter emergency medical service (EMS) flights, which are exempted due to their life-saving mission. Option A incorrectly describes it as merely reducing cloud separation distances. Option B misclassifies it as a danger zone (that would be LS-D). Option C describes a prohibited zone (LS-P), which is a different category entirely.
Correct: D)
Explanation: Magnetic declination (variation) is found by reading the isogonic lines printed on aeronautical charts such as the Swiss ICAO 1:500,000 chart. Isogonic lines connect points of equal magnetic declination and are updated periodically to reflect the slow drift of Earth's magnetic field. Option A describes a method for finding deviation, not declination. Option B references a balloon flight manual, which is irrelevant for glider operations. Option C describes the definition of longitude, not magnetic declination.
Correct: B)
Explanation: If the aircraft drifts to the left, the wind is pushing it from the right side of the flight path. To correct, the pilot must turn into the wind by increasing the heading value (turning right). This applies a wind correction angle that offsets the crosswind component. Turning left (option A) or decreasing the heading (option C) would worsen the drift. Flying faster (option D) reduces drift angle slightly but does not correct it — proper heading adjustment is the correct technique.
Correct: D)
Explanation: The GND designation on the Swiss gliding chart indicates that reduced cloud separation distances are permitted inside the designated zones outside military flying service hours. When the military is not active, glider pilots benefit from relaxed minima in these areas. Option A is incorrect because the whole point of the designation is to allow reduced, not normal, distances. Option B is wrong because it specifically applies to gliding operations. Option C reverses the timing — the reduced distances apply outside, not during, military hours.
Correct: C)
Explanation: Magnetic declination (variation) is the difference between True Course (TC) and Magnetic Course (MC), calculated as: Variation = TC - MC = 180° - 200° = -20°. A negative value indicates West declination, so the answer is 20°W. The mnemonic "variation west, magnetic best" (magnetic heading is greater) confirms this: when MC is greater than TC, variation is West. Option A gives the wrong direction (East). Option B is an arbitrary average. Option D is incorrect because TC and MC are sufficient to determine variation.
