Japanese seaplane tender Kimikawa Maru

A seaplane tender is a boat or ship that supports the operation of seaplanes. Some of these vessels, known as seaplane carriers, could not only carry seaplanes but also provided all the facilities needed for their operation; these ships are regarded by some as the first aircraft carriers and appeared just before the First World War.

The Imperial Japanese Navy was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrender in World War II. The Japan Maritime Self-Defense Force (JMSDF) was formed between 1952–1954 after the dissolution of the IJN.

Kobe is the capital city of Hyōgo Prefecture Japan. With a population around 1.5 million, Kobe is Japan's seventh-largest city and the third-largest port city after Tokyo and Yokohama. It is located in Kansai region, which makes up the southern side of the main island of Honshū, on the north shore of Osaka Bay. It is part of the Keihanshin metropolitan area along with Osaka and Kyoto. The Kobe city centre is located about 35 km (22 mi) west of Osaka and 70 km (43 mi) southwest of Kyoto.

The Aichi E13A was a long-range reconnaissance seaplane used by the Imperial Japanese Navy (IJN) from 1941 to 1945. Numerically the most important floatplane of the IJN, it could carry a crew of three and a bombload of 250 kg (550 lb). The Navy designation was "Navy Type Zero Reconnaissance Seaplane" (零式水上偵察機).

Kiska is one of the Rat Islands, a group of the Aleutian Islands of Alaska. It is about 22 miles (35 km) long and varies in width from 1.5 to 6 miles. It is part of Aleutian Islands Wilderness and as such, special permission is required to visit it. The island has no permanent population.

Attu is an island in the Near Islands. It is the westernmost point of the U.S. state of Alaska. The island became uninhabited in 2010, making it the largest uninhabited island to be politically part of the United States.

The South China Sea, or South East Asian Sea, is a marginal sea of the Western Pacific Ocean. It is bounded in the north by the shores of South China, in the west by the Indochinese Peninsula, in the east by the islands of Taiwan and northwestern Philippines, and in the south by Borneo, eastern Sumatra and the Bangka Belitung Islands, encompassing an area of around 3,500,000 km2 (1,400,000 sq mi). It communicates with the East China Sea via the Taiwan Strait, the Philippine Sea via the Luzon Strait, the Sulu Sea via the straits around Palawan, the Strait of Malacca via the Singapore Strait, and the Java Sea via the Karimata and Bangka Straits. The Gulf of Thailand and the Gulf of Tonkin are also part of South China Sea. The shallow waters south of the Riau Islands are also known as the Natuna Sea.

Cape Bojeador is the northwestern tip of the island of Luzon in the Philippines. It is a headland on the South China Sea coast of the municipality of Burgos, Ilocos Norte some 40 kilometres (25 mi) north of Laoag. The cape is best known for its Spanish lighthouse, the most visited lighthouse in the country and a favorite shooting venue for local movies and television series.

Luzon is the largest and most populous island in the Philippines. Located in the northern portion of the Philippines archipelago, it is the economic and political center of the nation, being home to the country's capital city, Manila, as well as Quezon City, the country's most populous city. With a population of 64 million as of 2021,  it contains 52.5% of the country's total population and is the fourth most populous island in the world. It is the 15th largest island in the world by land area.

The Philippines, officially the Republic of the Philippines, is an archipelagic country in Southeast Asia. It is situated in the western Pacific Ocean and consists of around 7,641 islands that are broadly categorized under three main geographical divisions from north to south: Luzon, Visayas, and Mindanao. The Philippines is bounded by the South China Sea to the west, the Philippine Sea to the east, and the Celebes Sea to the southwest. It shares maritime borders with Taiwan to the north, Japan to the northeast, Palau to the east and southeast, Indonesia to the south, Malaysia to the southwest, Vietnam to the west, and China to the northwest. The Philippines covers an area of 343,448 km2 (132,606 sq mi) and, as of 2021, it had a population of around 109 million people, making it the world's thirteenth-most-populous country. The Philippines has diverse ethnicities and cultures throughout its islands. Manila is the country's capital, while the largest city is Quezon City; both lie within the urban area of Metro Manila.

The geographic coordinate system (GCS) is a spherical or ellipsoidal coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude. It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others. Although latitude and longitude form a coordinate tuple like a cartesian coordinate system, the geographic coordinate system is not cartesian because the measurements are angles and are not on a planar surface.