I've used an INOGON entering a marina in the UK, and it really did have a very narrow dredged channel, not a wider safe area. One problem with lights or marks

I've used an INOGON entering a marina in the UK, and it really did have a very narrow dredged channel, not a wider safe area. One problem with lights or marks is that they can be very hard to see. At night, there are lots of other lights to confuse things, and it can be easy to mistake on light for another.