The RSC-107 Ramp Sight Compass is an aircraft compass alignment and calibration tool used on the ramp to verify and adjust the accuracy of installed magnetic compasses in aircraft.

It is designed with a 180° sighting handle system, allowing the operator to position themselves in front of the aircraft and visually align headings while communicating with cockpit personnel. The unit is used during compass swing and calibration procedures, ensuring the aircraft’s magnetic compass reads accurately against known headings.

The device comes in a protective transport case (typically Pelican-style) and is used by maintenance personnel, avionics technicians, and calibration specialists in general aviation and airline maintenance environments.

It is a precision ground-support instrument, not installed in the aircraft, but used externally during maintenance checks and certification procedures.

Key features include:

Ramp Sight Compass model: RSC-107
Ground support calibration tool for aircraft magnetic compasses
180° sighting handle design for alignment work
Used during compass swing / calibration procedures
Portable unit with protective transport case
Accuracy typically around ±2°
Includes calibration certificate (factory supplied)
Used in GA, commercial, and maintenance operations
Supports external aircraft heading verification on ramp
Designed for maintenance and avionics technicians
Not aircraft-installed equipment