Does this vhf exist?

If your trying to track your kids you can just get the gps tracker that you can use on a car and put it in in their yak

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Yes, It is for the kids.  Camping there are many lakes that would put them out of sight. Plus, we all like to return and trace our tracks when using the Garmin. I don't like risking the Garmin when on the water. I'm beginning to think that a GPS fishfinder is the way to go with cheaper VHF radios may be my best option.

Do they have smart phones? Maybe there is a way to use them in a phone "dry bag" and use the phone for that?

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If they have smart phones there is an app called "gps kit " after you buy / download it there is a feature called "squawk" which sends a signal via gps satellites signal or no signal showing you where the other is on google maps

I found perfect dry boxes for phones at Walmart. They fit my I-phone perfectly. That was a good call. Thanks.