For those who aren't familiar with them, tip-ups are strike indicators that rest above your ice fishing hole. Your line is typically attached to one end of the tip-up and lowered into the water and a flag is attached to the other end. When a passing fish strikes your line, the flag raises to let you know you a fish may be on the line.
The advantage of using tip-ups is that you can sit warmly in an ice shanty and watch your tip for strikes rather than sit in the cold holding a pole. Another advantage is that you can fish multiple lines at once.
The video below offers a few tips for ice fishing with tip-ups.
Click here to see an ice fishing tip for rainbow trout.