RepairPal Certified shops can diagnose and repair your 1999 Mercedes-Benz C280. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
It means "direction of travel" - but I'm not sure in any way why you'd get that message and what it has to do with why it won't start.
Use this link to find some shops near you that can help with your concern:
www.repairpal.com/repair-shops