The official guidance is very confusing and contradicts itself several times. If you go ashore at an approved location, you are supposed take your tracker with you.

I'm also told you are allowed to dive now. If you plan to dive, I'd recommend telling the arrival team that so you aren't fitted with a bracelet that could be damaged by the water pressure. Several of our quarantine guests have only had the black tracker box so I guess you just leave that on board if you dive.