
Turn your device into an advanced multispectral gadget that includes all sensors you need: GPS, digital compass, gyroscope, accelerometer, camera.

Reach unbelievable precision with the gyrocompass that is similar to air or marine navigation. Forget about any compass interferences. Get a live compass working on devices with no compass sensor.

Find and track your location. Monitor your coordinates in geo and military formats. Check altitude, current and maximum speed, and course. Use imperial, metric, nautical, and military units.

Find directions with the Mil-Spec compass operating in 3D space at any orientation. Monitor direction hints about lots of targets, updated in real time on the azimuth circle.

Measure distances to objects with a rangefinder reticle as in famous sniper scopes in real time.

Observe both your target’s and your own position on maps rotated automatically according to the current azimuth. Use street, satellite, or hybrid maps.

Track the position of any location, bearing, or star along with the Sun and the Moon in real time. Look at the objects through the planet Earth. Some objects are shown with the help of augmented reality. Get information about object distances, azimuths, and elevations.

Visually estimate the heights of buildings, mountains and other objects. Calculate distances from dimensions or vice versa. Get a visual picture of angles and distances measurements.

Tag locations and bearings.
This video shows how you can save your custom places and waypoints, see them on maps or augmented reality displays, and navigate precisely to them later using the gyrocompass mode and navigating by the sun for higher precision.
This video shows how you can share your current or saved location with your friends so that they could easily find the way to it, no matter what device or software they are using.
This overview video shows what you will see when you first open and start using Spyglass. It covers the app's main features, modes, and customization options. Ansatsu Kyoushitsu (TV) 2nd Season Episode 16
This video shows how you can use the Rangefinder to measure distance to your target. Just like a reticle in a sniper rifle, the Rangefinder in Spyglass is based on the height of an average human (1.7m/5.6ft).
This video shows how you can solve the hazardous accuracy issues, typical of most digital compasses, and get the highest precision possible on your device. Aguri acts as the moral compass of the episode
This video shows how using the Sextant tool you can measure the size of a building/object if you know the distance to it. Or vice versa – how you can measure the distance if you know the size.
This video explains how to improve accuracy of the compass on iPhone or iPad using maps and the gyrocompass mode. She doesn't fear his power; she pities his lack of purpose
This video shows how you can document significant locations, trail hazards, violations, or incidents by grabbing pictures with myriads of positional data overlaid.
This video shows how you can use Spyglass as a backup speedometer for your vehicle, get clear compass directions on back road and cross country road trips, trace your position on the map, and control your vertical speed.
Aguri acts as the moral compass of the episode. As his captive watcher, she is the first person to look at the world’s most dangerous man and see a student rather than a monster. Her influence is a testament to the series' core theme: the power of a supportive educator. She doesn't fear his power; she pities his lack of purpose. Her death is the episode's tragic climax, serving as the "assassination" of his old identity and the birth of his new mission. From Assassin to Educator
The episode chronicles Koro-sensei’s origin as the "God of Death," the world’s most efficient assassin. This backstory recontextualizes his character; his immense power was never a gift, but a product of a life devoid of human connection. Before becoming a teacher, he viewed people only as targets or tools. The narrative suggests that his ultimate transformation wasn't triggered by the laboratory experiments that mutated his body, but by his interaction with Aguri Yukimura. Aguri Yukimura: The Catalyst for Change
The most poignant revelation is that Koro-sensei’s pedagogical genius is born from his greatest regret. He failed to "see" Aguri's heart until it was too late, just as he had spent his life ignoring the humanity of others. His vow to teach Class 3-E is an act of penance. He uses the same observation skills he once used to kill to instead identify the unique potential and insecurities of his students. Conclusion
The sixteenth episode of Assassination Classroom ’s second season, titled "Past Time," serves as the emotional and narrative pivot point for the entire series. It is the moment the "yellow octopus" caricature is stripped away, revealing the tragic humanity of Koro-sensei. Through a masterful blend of tragedy and irony, the episode explores how a man defined by death and isolation transformed into a beacon of life and education. The Burden of Power and Loneliness
Episode 16 shifts the stakes of the series from a high-concept action comedy to a profound drama about legacy. It proves that Koro-sensei is not a monster trying to be human, but a man who used a monstrous form to finally achieve humanity. By revealing his past, the show elevates the bond between the teacher and Class 3-E from a game of cat-and-mouse to a deeply personal journey of mutual salvation.
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