There are also private balls. I've seen white, white with blue stripe and yellowish; they should say private or have a name. There recently was a well-publicized incident where a guy on a large cat, unauthorized, grabbed a private mooring, in poor conditions, with unfortunate results. The Boaty Balls have a different shape from traditional mooring balls.
He actually had permission and had been on one of the three private balls for the restaurant and was on one of the balls the week earlier. One of the 3 balls failed and had no idea it was bad. The Representative from Aquila Yachts actually showed up with a 54 ft Power Cat (Same size boat) and stayed on a ball in same conditions for over 90 minutes without issue.
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