Manskin Actual Location
The truth is that all the maps were correct as to the location of the Manskin Tribe. Before English Contact, the Manskin probably lived in both locations, with their main village at the Wormely location (Manskin Lodge)  and one of their summer camps on “the Island.” After Opechancanough determined that the English were a huge threat, he move his warriors- his army to ‘The Island” because it was a defensible location. His army consisted mostly of Pamunkey warriors, but also those of the Youghtanund and Manskin. In 1645, The Island Field army was destroyed, the remaining warriors were shipped to Tangier Island.
Since maps created in the 16 and 1700s were base less on trigonometry and more on hand drawings and interviews, it makes sense that the maps of the time show them in both locations because it depended upon who you interviewed as to where you placed them.
1680 Van Keulen
1670 Herman
Van Keulen copied the Herman Map but transposed the wording to put “Guttins Ile” above “Manskin,” probably due to interview discrepancies.  Notice the two Islands on the Van Keulen Map, this similarity of two islands is unique to the Herman Copies.