What is the correct communication for an altimeter setting of 30.05?

The correct communication for an altimeter setting of 30.05 is expressed as "Altimeter Three Zero Zero Five." This format adheres to aviation communication standards, which dictate that altimeter settings should be read in whole and decimal parts.

In this case, the setting 30.05 is broken down into three parts: the "Thirty" represents the "30" in the setting, followed by "Zero," which indicates the decimal point, and then "Five," which represents the "05." This method ensures clarity and precision in communications, as correct understanding of altimeter settings is critical for maintaining safe altitude levels during flight operations.

Other options may misinterpret the reading or introduce incorrect phrasing that could lead to confusion. For instance, saying "Altimeter Three Zero Five Zero" would inadvertently suggest an incorrect setting of 30.50 instead of the actual 30.05, while "Altimeter Thirty Point Zero Five" is not a conventional format used in aviation communications. The mention of "Altimeter Three Zero Zero Five Five" erroneously adds an additional number to the setting, which also leads to miscommunication. Thus, option A remains the clear and correct choice.