A Map of what later became New York, New Jersey and Pennsylvania. This was considered accurate and high technology. And a quote from a Swedish website.
The WIC had originally considered the Delaware River to be the potential center of New Netherland. Misinformation had equated the Delaware Valley’s climate with that of Florida. In 1633 the river froze solid enough to en- able Indians to cross on the ice (about one kilometer) and take up residence in the empty fort. When the Company first began to send over settlers in 1624, several families were sent to High Island (Burlington Island) on the Delaware where Fort Wilhelmus was established. Soon after these settlers were withdrawn in 1626 for resettlement on the newly purchased Manhattan Island, Fort Nassau (Gloucester, New Jersey) was constructed to maintain the Company’s presence on the Delaware. However, lack of financial and human resources made it possible only to garrison the fort during the trading season—between May and September. Thus it was used as shelter for the Indians in the winter. In 1635 it was occupied by English soldiers from Virginia, who were quickly expelled by a military force sent to the area by Director Wouter van Twiller. Nevertheless, such activity shows that the region was a low priority until the Swedes appeared in 1638.
I added the emphasis.
