In order to be closer to the rules from FIS the Annual Meeting in Cogne decided to test out arrow start in all competitions during the MWC 2019 in Beitostølen. Here are the rules from FIS:
315.3 Mass Start Procedure
315.3.1 The Mass Start should be carried out using angled start lines in shape of an arrow. This means that the athlete with start number 1 has the most favorable start position followed by start number 2 etc. Each competitor should be separated by a fixed distance interval. Number one will be in the middle position; even numbers are placed on the right and odd numbers on the left side of the arrow. The numbering mark should be placed to the right or in the middle of the track.
315.3.2 The starting procedures for a Mass Start will begin two minutes before the start signal. At this time instructions about the start will be given to all competitors assembled in their start lanes. These instructions should end with the competitors being instructed to stand at their start positions and a 52 “one minute to start warning” is given. Next there will be the command “30 seconds to start”. When all competitors are motionless then the next sound will be the start command or signal.
315.3.3 Competitors are not allowed to change tracks within marked corridors the first 30-50 m after the start line.