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.