Each student pursuing a geosciences degree is assigned a faculty advisor in the department. Prior to registering for courses each semester, the student meets with their advisor to review their proposed courses and make sure they are making logical overall progress towards the degree. When these things have been discussed at the student/advisor meeting, the advisor gives the student a PIN (Personal Identification Number) that allows them to register.
Another useful tool available through Maine Street is the Wish List. Students may fill in their Wish List with the courses they want to register for, and an advisor can review that list and OK it, allowing the student to register for those classes. In some cases this may be a useful alternative procedure.