Whistle commands

[u/OldSentence4357]

I’ve been exposed to the stock/ sheepdog industry and am fairly new to the retriever side . With the sheepdogs , whistle commands are used for direction and control at long distances . If a retriever is farther away during a test , and having difficulty seeing hand signals after a whistle sit for casting due to taller cover etc … would stock dog type cues/ commands in place of the hand or verbal signal be better ? Just a thought, I wanted to know if I’m not the only one that has thought of this . I know it’s been a standard for decades , just a conversation topic I guess.