What equipment is necessary for manual emplacement?

The correct answer includes the gunner's quadrant, aiming circle, and speed wrench, which are essential tools for manual emplacement of artillery systems. The gunner's quadrant is crucial for measuring angles of elevation and ensuring proper alignment during setup, helping the crew achieve the desired trajectory for firing. The aiming circle assists in accurately determining and setting azimuth, which is vital for directing fire at precise targets. The speed wrench is used to quickly and effectively secure the various components and settings of the artillery piece, allowing for efficient operation and reducing the time required for emplacement.

In contrast, the other options include tools that may be beneficial in certain contexts but do not encompass the fundamental requirements for successful manual emplacement. For example, while a rope and shovel could potentially assist in adjusting the position of equipment, they lack the precision needed for properly measuring angles and alignment. Similarly, while a GPS can be advantageous for navigation and localization, it is not strictly necessary for the manual setup of artillery systems, which relies more on traditional surveying tools like the aiming circle and gunner's quadrant.