Hi Tertiary Education,
From the way you describe it your pages are being considered duplicate content becuase they are so very similiar, that is to say that they are near-duplicates if not actual duplicates.
It sounds like the content on those pages is somewhat thin- is there anything else on the page apart from the map? If the answer is "no", or "not much", then consider padding them out with (quality) content that serves your audience. I think this is what Patrick is referring to with his suggestions (forgive me if I am mis-interpreting you Patrick!), and I think he is absolutely right. Other things to consider as creating unique title and descriptions for each page (I mention it in case you have over looked it).
By adding valuable differentiated, content to those pages you will be differentiating one from the other as well as providing value to your users. As Moz sees these changes it should stop flagging them as duplicates, and as google re-indexes the pages it will begin to appreciate the differences between them and gradually index them as non-duplicate content.
Hope that helps