All depends what sailing I am doing. If I anticipate I’m going to need the motor at some point then I mount it on the transom. If I’m in “aesthetic purist mode” and there’s a good breeze I like to hide it in the rear locker knowing it’s there for emergencies. It can be a hassle getting the motor mounted once you are out on the water though, eg needing to drop the anchor to stop you drifting backwards or worse trying to get out the way of some big boat…. oars are a quicker way to get you moving.
As a slight deviation how have people here established their boat speed? Mine was a guestimate and obviously over a distance you could calculate your speed from time travelled and maps or charts. Or were most people reading off handheld GPS?