Hourly NAP Charts
- ACMA HFDF Perth Darwin Brisbane BUF NAP
- ACMA HFDF Brisbane BUF NAP
- ACMA HFDF Darwin BUF NAP
- ACMA HFDF Perth BUF NAP
BUF: Best Usable Frequency, displays the frequency that has the largest signal to noise value of those frequency/mode combinations that satisfy the provided minimum angle, required percentage number of days and required signal to noise parameters specified.