An address direction guiding apparatus includes: an azimuth sensor configured to measure an azimuth; a light output unit configured to output light; and a control unit configured to control the light output unit to output light differently depending on an angle between a target azimuth and the azimuth measured by the azimuth sensor.

An address direction guiding apparatus includes: an azimuth sensor configured to measure an azimuth; a light output unit configured to output light; and a control unit configured to control the light output unit to output light differently depending on an angle between a target azimuth and the azimuth measured by the azimuth sensor.

A hub imaging angle monitoring apparatus includes an X-axis accelerometer, a Y-axis accelerometer, a Z-axis gyroscope, a micro-processing unit and a power supply unit arranged on a hub. The power supply unit supplies power to the X-axis accelerometer, the Y-axis accelerometer, the Z-axis gyroscope and the micro-processing unit, respectively; and the micro-processing unit is configured to drive the X-axis accelerometer, the Y-axis accelerometer, and the Z-axis gyroscope to monitor movement data of the hub, and to perform a fusion processing on the movement data to determine the imaging angle of the hub.

A method of assisting piloting, which method comprises the steps of designating a landing point and determining a sighting axis. A single three-dimensional main symbol providing a conformal position of the landing point is displayed on the screen so long as it is present in a field of view along the sighting axis, the three-dimensional main symbol extending in elevation upwards from the ground from a bottom zone positioned on the ground up to a top zone positioned at a top height relative to the ground. At least while the aircraft is situated at a distance from the landing point that is less than a first threshold distance, at least one two-dimensional main symbol covering a target zone is displayed.

A combined square leveling for combing multiple construction tools into a single device includes a framer's square for measuring angles during construction. A tape measure is retractably positioned within the framer's square and the tape measure is urgeable outwardly from the framer's square for measuring distance. The tape measure is biased to retract into the framer's square. A bubble level is coupled to the framer's square to determine if a surface is level. A laser level is slidably coupled to the framer's square to emit a beam of light to establish a reference point on a distal object.

A combined square leveling for combing multiple construction tools into a single device includes a framer's square for measuring angles during construction. A tape measure is retractably positioned within the framer's square and the tape measure is urgeable outwardly from the framer's square for measuring distance. The tape measure is biased to retract into the framer's square. A bubble level is coupled to the framer's square to determine if a surface is level. A laser level is slidably coupled to the framer's square to emit a beam of light to establish a reference point on a distal object.

The present disclosure provides a method for measuring an angle and a distance. The method includes: at an initial position, after a laser emitting device aligns with a laser receiving device, recording a first angle and measuring a first distance between the laser emitting device and the laser receiving device; and moving the laser receiving device from the initial position to a first position, and after the laser emitting device realigns with the laser receiving device, recording a second angle and measuring a second distance between the laser emitting device and the laser receiving device. The method for measuring the angle and the distance creatively records the corresponding angle and distance at different positions, respectively, such that the position of the laser receiving device relative to the laser emitting device is accurately determined.

The present disclosure provides a method for measuring an angle and a distance. The method includes: at an initial position, after a laser emitting device aligns with a laser receiving device, recording a first angle and measuring a first distance between the laser emitting device and the laser receiving device; and moving the laser receiving device from the initial position to a first position, and after the laser emitting device realigns with the laser receiving device, recording a second angle and measuring a second distance between the laser emitting device and the laser receiving device. The method for measuring the angle and the distance creatively records the corresponding angle and distance at different positions, respectively, such that the position of the laser receiving device relative to the laser emitting device is accurately determined.

A combined square leveling for combing multiple construction tools into a single device includes a framer's square for measuring angles during construction. A tape measure is retractably positioned within the framer's square and the tape measure is urgeable outwardly from the framer's square for measuring distance. The tape measure is biased to retract into the framer's square. A bubble level is coupled to the framer's square to determine if a surface is level. A laser level is slidably coupled to the framer's square to emit a beam of light to establish a reference point on a distal object.

A combined square leveling for combing multiple construction tools into a single device includes a framer's square for measuring angles during construction. A tape measure is retractably positioned within the framer's square and the tape measure is urgeable outwardly from the framer's square for measuring distance. The tape measure is biased to retract into the framer's square. A bubble level is coupled to the framer's square to determine if a surface is level. A laser level is slidably coupled to the framer's square to emit a beam of light to establish a reference point on a distal object.