You bet your pack should contain a few additions. Neither list includes an item for audible signaling. Though the flashlight could signal your position at night, a whistle will work day or night to help attract attention and possibly rescue. Similarly, a signal mirror can also help to signal your distress. But the best signal of all is some form of communication device. Two-way radios, a charged cell phone, or a satellite phone should allow you to call for help more effectively than any rudimentary tool. Add some water-purification items and cordage, and you'll have a fairly complete survival kit based on the Ten Essentials.