Ah, yes: cieplik206 is right. Don't use the quick set more than once. It should be used once (many people don't like it, and don't use at all, me included), and never again. It can mess up what is already done.
Groove should be ready to roll: it's default config is CPE Router, and that is exactly what You want. Just plug it in ether5, and it should work.
On thing should be changed, either at Groove or at hAP AC: both of them use 192.168.88.1 as internal network. It won't work this way.
I think it's easier to change the hAP, since we will be connected directly to it.
We need to choose a new network for it. How about 192.168.89.0/24?
1) Open Winbox (https://mikrotik.com/download
), and connect to the hAP through MAC address. Yes, we need it to be through MAC, since we will be changing the IP of the unit.
2) Go to ip -> address. You can just change it from 192.168.88.1 to 192.168.89.1 (we just added 1 to the "88" part).
3) Now, go to "ip -> dhcp server -> networks". Open the existing one. Change everything there, from "192.168.88.x" to "192.168.89.x"
4) Go to "ip -> pool". Open the existing one. Change everything there, from "192.168.88.x" to "192.168.89.x"
Now, how does it work?
When you get to a new marina, you open the Groove (192.168.88.1), and
1) Go to "wireless -> security profiles" and create a new one to this marina. One good idea is to name the profile after the marina. This way is easy to identify.
2) Go to "wireless -> wifi interfaces" and open the existing one. Change the security profile to this new one.
3) Done! You should be connected now.
If you are returning to this marina, you can skip the step 1 above, and just change the security profile being used.