"according to the navigation rules, what factor should be considered in determining a safe speed?

Visibility conditions.

Explanation:

Safe speed is a speed at which the operator of the boat can take effective action to avoid stops within the distance. To calculate the safe speed visibility conditions (fog, rain, mist, and darkness) should be included. We should also include some other factors given below:

i)Traffic density

ii)Type of vessels in the area

iii)Wind

iv)Water conditions  

hèllo, sorry i really need some more points so if you need this qustion answered than retype it

the right answer is 0.3 meters per second