Everything else on the Sharm water is priced per head, so the catamaran only makes sense once you count the group.
What does per-boat pricing work out at per head?
The boat costs the same whether two of you are aboard or ten, which is why this is the format for a family or a group of friends rather than for a couple looking for the cheapest morning out.
Half day, full day or dinner?
The grid is unusual in that a dinner cruise costs the same $600 as a morning half day, and the full day at $1,200 is exactly two half days rather than a discount. Overnight is $1,500. If your plan is a swim, a snorkel stop and lunch, the half day covers it; if you want to reach the further reefs and still have time in the water, take the full day.
Is there anything to settle at the pier?
The park fees, the cruise permit and the fuel are all stated as included, so there is nothing to hand over at the pier. Among the dive centres, Mr. Diver quotes the same way; most dive boats add a park fee and gear rental on top of the price they advertise.
Important
the only extra named on this boat is snorkelling gear rental, $5 per piece.