 This entry surveys the current state of the field by paying particular attention to how theories of modal knowledge have addressed the Access question and the Navigation question. (For other surveys: Gendler &amp; Hawthorne 2002; McLeod 2005; Evnine 2008; Strohminger and Yli-Vakkuri 2017; Mallozzi 2021c.) For each theory we discuss, we propose a number of critical questions. These questions serve a dual purpose. They recapitulate the central points for the theories and raise concerns about them.