When leading a group, we certainly follow that plan--although we will have one person in the lead, and another "leader" at the back...allowing people to hike at their own pace in between.
When it's just the two of us (and we've been married 33 years and hiking together longer than that) we are a bit more casual about staying right next to each other. And in all those years, these are the only two times we've used the whistle.
But seriously---if you're hiking with your long term partner or wife, you really try to stay within what....ten feet of each other? twenty?
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