Team Logo. The Portsmouth Explorers were a team in the Frontier League. They had a losing record all three of their seasons. They moved to Illinois in 1996 and became the Springfield Capitals. Retrieved from "https://prosportsteams.fandom.com/wiki/Portsmouth_Explorers?oldid=12073" Categories: Former FL Teams Teams in Ohio Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.