Which of the following are properly formatted entries for two fax machines on vessels in the AOR-W?

The correct choice involves properly formatted entries for two fax machines using the appropriate international numbering system for maritime communications, specifically in the area of responsibility for vessels operating in the AOR-W (Atlantic Ocean Region – West).

In international telecommunications, the correct format typically begins with the country code, followed by the full telephone or fax number. For maritime vessels, particularly in AOR-W, the fax numbers start with the maritime mobile numbering format. The correct structure includes the relevant country code, which in the case of satellite communication, results in a number that follows the international standards.

The first choice consists of two valid entries, both starting with "870," which is the code assigned to Inmarsat telecommunications for maritime use. These entries correctly represent the structure needed for identifying fax machines on vessels. Additionally, there are no additional erroneous digits or formatting issues present in this representation.

In contrast, other choices either introduce additional digits that exceed the permissible length for such fax numbers or contain incorrect country codes that do not represent valid maritime mobile numbers. For example, adding more digits than necessary can result in misdialed communications and confusion, and using a country code outside the prescribed maritime mobile range can lead to a failure in reaching the intended recipient.

Therefore, the proper formatting of