Galaxy 7 Cell how can default the WiFi Netork

[AC Question]

I have several WiFi networks, how can I automatically select one as a "default?"

 

[CWinkler]

I have a similar question. I pass through 1 or 2 different WiFi networks on my way home to my boat. Then I have my own network on the boat. My S7 seems to lock onto one of the other 2 networks and hold it, even if the signal strength isn't very strong. Then I have to physically go into the phone and connect to the boat's network. Is there a way to have my phone automatically go to the stronger of the networks, which should normally be my own? Short of 'forgetting' the other 2 networks which I do also use at times, so don't want to have to re-enter passwords.