QTH locator is the system of a proximate location
indication of an object on the Earth surface, generally accepted in amateur radio communication.
It is designed to determine the distance between distant stations. It is also known as Grid Square Locator and Maidenhead Locator System.
Its name derives from code abbreviation QTH which means “My location is…”
The entire surface of the earth is divided into 342 sectors, which have size of 10 degrees of latitude and 20 degrees of longitude. Sectors are denoted by two capital Latin letters. Each sector is divided into 100 larger squares, size of which is 1 degree of latitude and 2 degrees of longitude (approximately 78×111.4 km in middle latitude), they are denoted by two figures. A large square is divided into 576 small squares — 2.5×5 minute of angle (approximately 4.6×6.5 km) denoted by two lower case Latin letters. If a better accuracy is needed, a small square can be divided into 100 even smaller squares denoted by figures, and further in the same order.
In order to know QTH locator, click on the map or enter QTH locator manually.
In order to know the distance between locators, choose the first locator, press ▲▼, and choose the second locator.A little help