GMDSS. FCC Test 58

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A ship at anchor has been communicating marginally with a shore station approximately 200 miles (322 km) distant on a frequency in the 4 MHz band periodically throughout the day. Toward the late afternoon and evening, what effect should be noticed?
At mid-night, what would be the best choice in attempting to communicate, using NBDP with a shore station some 800 miles (1,287 km) distant?
Which of the following is a source of solar flux conditions that can be used with propagation software as an aid in predicting the best frequency band to use for HF radio communications?
Which statement concerning frequency band selection and propagation most corresponds with standard practice.
GMDSS operators should learn which of the following propagation 'rules of thumb'?
At mid-day in summer, what would be the best choice in attempting to communicate, using NBDP with a shore station some 800 miles (1,287 km) distant?
A ship at anchor has been communicating effectively with a shore station approximately 500 miles (805 km) distant on a frequency in the 16 MHz band periodically throughout the day. Toward the late afternoon and evening, what effect should be noticed?
GMDSS operators should routinely focus on the factors affecting propagation in what priority?
To ensure effective communications, GMDSS operators should:
The 'short rules' of propagation necessary to select the appropriate frequency band are:
Finish