1) What should I do if I want to descend earlier, perhaps 10-15nms from Top-Of-Descent? Do I press the 'DES NOW' LSK Key in DES VNAV Page and reset MCP Altitude or should I just enter the new MCP altitude and push the altitude button? I dont know.
2) How do I know what runway to land on? Since I dont use IFR planning and neither do I use ATC during my flight except during takeoff and landing.
One more concern that I have is, I'm not always available to monitor my flight, so engage VNAV and LNAV, but sometimes when i return I find my VNAV disconnected and the plane exceeding bank angle with the plane going off course despite LNAV being turned on and autopilot being on.
Please help guys