Best advice for two internet inputs (LTE & WiFi) on boat

RouterOS Beginner Basics
1

Hi,
I have a HAP AC router and Groove Metal as a boat WiFi access point.
I’m trying to get the best internet signal in my boat.

I have successfully made the connection using ether5 as the WAN connection - made that decision so I could use the POE.

I think I’m going to add an alternate LTE input (Netgear LB1120 LTE modem/router).

This means I’ll probably want to use ether1 for that connection.

How can I setup the router so that I can manage without having to make physical changes to the router to effect the change?
Scripts perhaps - I know nothing about them but it might be a way.
This is an open question - I’m not there yet.
Cheers and Thanks!

2

Sounds like someone has been reading sailbits.com. I’m currently down the same path, but haven’t added LTE yet. I was trying to prevent double nat without losing console access to the groove. I’ve not yet investigated the scripting aspect of it.