On Mon, 15 Apr 2019 20:29:26 -0400 (EDT), Justan Ohlphart wrote:

True North Wrote in message:
I was thinking of getting a set off and on for the last 15 or more years. They started off with modest range claims but seemed to get more powerful maybe up to or so kilometers. Even wondered if they would help communicating with the wife while backing the boat into the driveway. She likes to hide in my blind spot while directing me.

Why don't you educate her on where to stand and how to signal. A
good spotter is worth his/her weight in gold.

We now have a good system. She stands where she wants the driver's side rear corner of the rig. I
aim for her. Simple. No yelling, no waving, only a fist when it's time to stop. If she leaves the
spot to check the passenger side, I stop until she returns a few seconds later.

Works well.