As much as you can get. Crew? Provisions? fuel? Adds even more. PLUS damages. A 115er should already have an expense history and charter plan. It would also have to have a current COI. Insurance underwriter may have something to add also; Use above and beyond normal service.
Depends on the boat, age, location, etc but should be in the $70-$90k range plus expenses and gratuity. Expenses usually run 20-30% of charter fee. Less if running minimal distances more if the locations are further away One issue will be the film crew size. Here in the US, without a COI, the limit will be 12 passengers. If the charter/shoot takes place outside the US, the insurance will probably limit the pax number to 12 as well
a boat that size can take 12 passengers as a UPV so no COI needed. The fact that it s a movie shoot wouldn't affect insurance. 15 years doing charter and we ve never had any damage caused by guests. Including film and music video shoots.