Do you see many connections between the work that dispatchers, harbor pilots, yardmasters, and air traffic controllers do? Why or why not? Explain why you think their salaries vary so much.

Yes, There is a connection between dispatchers, harbor pilots, railroad yardmasters and air traffic controllers because they direct and pass on information  to the drivers, captains (and ships), train drivers, and pilots

Explanation:

Their salaries vary much because of the the difference of the level of skill required for their service with the level of variation of skill required directly resulting in a larger pay package with the following factors contributing to a higher wage cutting across the listed professions;

a) Credentials

b) Tasks required in the job

c) Skill and experience

d) Location of job task

e) The employer or industry

f) Level of performance and the reward of success

Each of the job are now graded from 1 to 10 based on the above factors

-Dispatchers

a - 6, b - 6, c - 6, d - 6, e - 8, f - 7

-Harbor pilots

a - 9, a - 10, c - 9, d - 10, e - 10, f - 10

-Railroad yard master

a - 7, a - 8, c - 7, d - 6, e - 8, f - 6

-Air traffic controllers

a - 8, a - 8, c - 7, d - 7, e - 10, f - 10.