Servo rotates 360 degrees

Hello, I tried to control my servos with the gripper method.

Do servos need to spin at a certain pwm value? My servos spin clockwise and counterclockwise without stopping.
If I set GRIB_GRAB=0 it stops but when I give the command to move it starts spinning endlessly.(mg90 s,servo)
My goal is to have the drone start and stop the servo when it comes to a certain waypoint.
How should I go about doing this?

If you have a continuous rotation servo, the PWM values control the rotation speed/direction, not the position. Use a common RC servo, if you want the servo to move to a certain angle.

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