Here is a renown chart, but it seems that it's for an older version of GWX, and the values are wrong for some ships. Hopefully someone has a similar chart for GWX 2.1.
Also, the renown values for each ship can be found in sh3\data\sea folder, in .cfg files. But getting data from these files can be a tedious task.
The realism settings also affect the renown value. Here is a formula to calculate renown value regarding to realism:
Code:
renown value = base ship renown value * ( (0.75 * realism %) + 0.25 )