The spelling of the word "GATV" can be explained using the International Phonetic Alphabet (IPA). The letters "g," "a," and "t" represent the sounds /g/, /æ/, and /t/ respectively. The letter "v" represents the voiced labiodental fricative sound /v/. Thus, the word "GATV" is pronounced as /ɡætv/. While the word itself may not have any meaning or context, understanding the IPA phonetic transcription can assist in proper pronunciation of various words and languages.