The Coast Guard is alerting residents of ice-breaking activities scheduled to begin Tuesday and last into the weekend. The nearest towns to Pere Marquette Lake are Ludington and Scottville, Mich. The research vessel Sikuliaq is scheduled to transit through Pere Marquette Lake multiple times in order to gain access to Ludington's Occidental Chemical Facility, Feb. 18-22. The vessel has icebreaking capabilities. All ice fishermen should remove their ice shacks and equipment from these areas. Snowmobilers, all-terrain vehicle operators and other recreational users of the ice should plan their activities carefully, avoid shipping channels, and use caution near these areas of operation.