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I did not use links for the breadcrumb trail unless the sub section has more than one page (section title > sub section title > sub page 2) in which case I add a link back to the top of the sub-section. I did not use links for the section title because the main nav appears on each page. Should I?
Usually, if you are at the main page where just the one bread crumb is showing which in your case is the section title, it would not be linked since the page would reload itself and confuse the visitor. Having the main sections linked in the left nav is the proper way to do it.
I use my Chain of Command theory when linking. In a breadcrumb scenario as you describe, the Admirals (top of the chain) are always viewable at left (or elsewhere) and linked since they lead to main sections. Once you click on one of the Admirals, you are taken to the entrance of that Admirals quarters.
The Admiral's quarters now list the Vice-Admirals under him. The Admiral stands watch at the top of the page (first breadcrumb - not linked). As you visit each Vice Admirals section, the Admiral becomes linked at the top so that you can find your way back to his quarters while the Vice Admirals become the next in the breadcrumb trail, delinked. And so on, and so on.
Based on your explanation of what you are doing, it sounds like you have it down pat. Just make sure the Admiral is always available, especially once you've made it down the trail into the Petty Officer's area.
Now, if that didn't confuse you, let me know! ;)
P.S. For those reading this thread, a Breadcrumb Trail is a link structure that normally shows at the top of the page and shows the user where they are in a particular section that has lots of content.
When you use a directory, most have a breadcrumb trail at the top showing where you are in the directory structure, something like this...
Main Cat > Sub > Sub > Sub > Page
Instead of using your back button, it allows you to follow links back to the beginning in a similar fashion as using the back button.
(If you asked for my usability feedback, though, I'd say "link it" - I'm pretty sure users would expect it to be linked, IMO.) :)