Lately I got some really surprised developers, when I showed them or told them to us „Go to Definition“.
It seems like this not so new feature is still not known to the nav development group.
If you know have a puzzled look, you may allow me to show you what there is.
Go to the customer table (18) and look into the contact-on validate trigger.
Here you find a line UpdateContFromCust.InserNewContactPerson(…
When you do a left-click onto the function name InsertNewContactPerson the context-menu shows Go to Definition.
When clicking on this Codeunit CustCont-Update (5056) is opened and shows the selected function.
Have fun trying it.