6. Group Safety: Leave your driver with a list of contact details, and emergency contacts for each walker. They should know your intended routes and any summit ETA's, plus the time you should arrive back at the vehicle. Agree a plan of action should you not return by a certain time, and if no contact between the group/driver is possible. A mixture of mobile phones and VHF radios can help maintain contact - just remember that batteries do fail, signals are lost, and radios have lots of 'dead' spots. Any group should have enough first aid, safety and emergency equipment to remain 'comfortably' on the mountain for at least a few hours during night-time.