NetLogo - What is 1 distance unit in NetLogo?

Question

I am working on traffic simulations using NetLogo for a post graduate project.

For turtles to move forward we can specify the number of units it can move e.g. fd 1, which would mean the turtle moves forward by 1. What is this 1 unit? Is it equal to 1 patch or equal to the size of the turtle?

Answer 1

Each step is the same size as the patches.