While this is not the best place to go into map legends, there is a few things that are important to mention.

Other annotations can include the new course, heading, altitude, air speed, radio frequencies, the required fuel to get back, to the next checkpoint or to a divert, alternative or emergence airfield, etc. These are called minute marks and significantly eases finding out where you are depending on the time and also eases catching up any timing errors. In a later stage after the calculations are done ticks are added to the tracks usually with a few minutes distance between them annotated with either the total number of minutes from the start, minutes from the last checkpoint or the time. While a double decker may turn on a dime a jet fighter at high speed might have a turn radius of several miles, which significantly shifts its course to the next checkpoint. The size of the turn arcs, if the are drawn at all, are depending on the scale of the chart, the turn angle, and the performance of the aircraft. The tracks might involve turn arcs, preferably after the checkpoints, shifting the tracks to the side altering the course of the leg to the next checkpoint. That is finding suitable checkpoints, marking them and plotting tracks between the checkpoints. Usually, the first step in planning is part of the map preparation. In essence the things drawn on the map must be unambiguous and be possible to read on a glance. One very important thing to keep in mind is that you might not have all that much time in the cockpit to read the map. This can be done in many ways from very simple to all the way to extremely detailed.

In order to effectively use the map it is usually prepared with checkpoints, tracks, minute marks and various annotations. The two main uses for the map is to catch any signs of drift before you have drifted too far off course, and to accurately find and turn at checkpoints. Pilotage or map reading is, in fair weather and at a bit higher altitude, nearly independent of dead reckoning.

1.2.2 FlightGear's terrain and real maps.

Computer air navigation dead reckoning