I always use a lanyard. The reason is more because I am simply use to having it on. I officiate multiple different sports that use a whistle and almost every one has an exception that we have a whistle and lanyard. I can't image doing a swim meet, volleyball, or other sport without a lanyard whistle.
I can just image doing a volleyball match while holding my whistle in my hand and having to bring it up to blow it for a call. That would not go over well.
Personally I plan on still using a lanyard.
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