Through HF radio and my satellite phone, I can connect my computer to receive weather charts and maps, and send and receive email...although the transfer/download rate is v-e-r-y slow.
Depending upon a natural phenomenon known as 'propogation', I can communicate with HF over distances as great as 20,000 kilometers. (HF = High Frequency. VHF = Very High Frequency. Frequency relates to the length and duration of radio 'waves').
Also necessary to traditional navigation skills (as opposed to electronic, Hi-tech) is an accurate barometer, to measure the pressure of air, and an accurate chronometer for use when using a sextant to determine the vessel's position at sea.
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