Measurement method and measurement tool for navigation light installation angle

The invention discloses a method and a tool for measuring the installation angle of a navigation light, and belongs to the technical field of ships. According to the method for measuring the installation angle of the navigation lamp, the navigation lamp comprises a base fixed to a ship and an all-around lamp, a light shielding plate is arranged on the base, four installation holes are formed in the base, the all-around lamp is installed on the base through the four installation holes, and the light shielding plate partially surrounds the periphery of the all-around lamp. The navigation light installation angle measuring method comprises the following steps: S1, aligning the circle center of a full circle protractor to an intersection point formed by four installation holes; s2, the visor comprises a front visor and a rear visor, the front visor is provided with a first edge, the rear visor is provided with a second edge, a first connecting line is formed between the first edge and the cross point through scri