This aspect is a bit buggy - I often have situations where I should be able to see into the province (ie see the units/buildings) because my boat is the only one there, but can only actually see the parchment. I haven't pinned down qute what causes it - maybe there was an enemy boat there last year (or next year?!), or maybe my ship needs to take an extra year to get close to the shore. Whatever, it's frustrating!