Near-Real-Time F2-Layer Critical Frequency Map
- This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space.
The map shows the radio auroral zones as green bands near the northern and southern poles.
- shows time zones around the world a well as the time at locations of your choice.
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- This program graphically shows world time zones and their corresponding times. Just tap on the map to see the time in that part of the world.
A list of three cities at the bottom of the screen can be customized to any city from the list provided. This list can also be updated using a PC program provided.
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Not satisfied ? Lookup Google Custom Search Engine for map zones