If you are chartering a boat, you have a right to obtain, well in advance of your trip, a complete list of everything that is included, and that certainly includes a detailed description of all navigation and safety equipment and aids.
The only reliable source of info re what's on the boat is what you get from the charter company. You should insist upon this, so that if there is something that you feel is essential that is not included, you can determine if its available for an extra fee, how much it costs, and whether it is even available at all.
If this info is not in the packet you received when you signed up and paid your deposit, insist on getting it.
You should also inquire about travel and weather insurance. Is this available as part of your charter options? If not, you might want to consider purchasing it separately, so that in a worst-case scenario (unusual weather pattern) you don't lose all your money while stuck on land.