The following are ourtesy of Luiz Kahl at Yacht Scoring
Real time calculator:
Pursuit race calculator:
For Organizing Authorities: Want to make some races more interesting? Ever thought about a Pursuit Race under IRC? Yes, it can be done! We have developed a spreadsheet to help you organize the starting times for different boats under IRC and provided some instructions on how/where to set the finish line. Download the spreadsheet and give it a try! "