However, in an emergency, divert promptly toward your  alternate destination. Attempting to complete all plotting,  measuring, and computations involved before diverting to the  alternate destination may only aggravate an actual emergency.  Once established on course, note the time, and then use the  winds aloft nearest to your diversion point to calculate a  heading and GS. Once a GS has been calculated, determine a  new arrival time and fuel consumption. Give priority to flying  the aircraft while dividing attention between navigation and  planning. When determining an altitude to use while diverting,  consider cloud heights, winds, terrain, and radio reception.  This chapter has discussed the fundamentals of VFR  navigation. Beginning with an introduction to the charts that  can be used for navigation to the more technically advanced  concept of GPS, there is one aspect of navigation that remains  the same—the pilot is responsible for proper planning and  the execution of that planning to ensure a safe flight.  Chapter Summary  16-35 