1450 WHLS Port Huron/1580 WHLX Marine City/105.5 W288BT St. Clair, MI made their flip from Classic Hits “The Cruise” to an Active Rock/Alternative hybrid “Rock 105.5” this morning. Billed as “Port Huron’s Alternative”, the new format will give Blackburn Radio’s “K106.3” CHKS-FM Sarnia, ON a competitor on the American side of the border. Original Report 4/15: Radio First Classic Hits “The Cruise” 1450 WHLS Port Huron/1580 WHLX Marine City/105.5 W288BT St. Clair, MI is promoting a format change for Monday, April 20 at 10:55am. At that time the station will flip to “Rock 105.5” with the FM translator becoming the primary brand. Rock1055.com was registered by Radio First on March 30 for the stations.