October 1, 1998 – GMA Network acquired the Channel 5 frequency from ABC and its callsign was changed to DXMJ-TV. As part of its acquisition, GMA's transmitter site transferred from its original location in Tagum City, Davao del Norte to Shrine Hills in Davao City. Following these changes, Channel 5 was relaunched as a GMA Network station and became a relay station delivering programs from Metro Manila via DZBB-TV.
October 4, 1999 – DXMJ-TV was upgraded into an originating station with the producing of its regional newscasts Testigo (initially known as Testigo: GMA Super Balita), a localized version of the network’s longest-running newscast Saksi, focusing on news coverage for the Davao City area. This was soon followed by the launch of the musical variety show Singgit Davao on October 24 of the same year. Shortly thereafter, GMA’s television operations in Davao relocated to the Amesco Building along Magsaysay Street, which had been the home of GMA’s radio stations since its inauguration in 1996.
May 5, 2008 – GMA Davao relocated its television studios to its transmitter site in Shrine Hills, Matina, moving from its original studio at the Amesco Building. The Amesco Building continued to serve as the headquarters for GMA Davao's radio operations until it eventually moved to Shrine Hills in January 2010.
June 27, 2018 – GMA Davao commenced ISDB-T digital test broadcasts on UHF Channel 37 (611.143MHz) through Metro Davao, spent PHP 32.98 million. It later expanded across parts of the Davao Region, spending PHP 7.56 million for the station upgrade to 15 kilowatts within March 15, 2020.
Red: Home location of GMA Davao Light red and red: Market audience of GMA Davao Violet: Areas that may receive signals from GMA DavaoRed: Home location of GMA Northern Mindanao Light red and red: Market audience of GMA Northern Mindanao Violet: Areas that may receive signals from GMA Northern MindanaoRed: Home location of GMA General Santos Light red and red: Market audience of GMA General Santos (de jure) Violet: Areas that may receive signals from GMA General SantosRed: Home location of GMA Zamboanga Light red and red: Market audience of GMA Zamboanga Violet: Areas that may receive signals from GMA Zamboanga
Since 2017, GMA Davao’s programming has been broadcast across more than fourteen relay and rebroadcasting stations throughout Mindanao, significantly extending its regional reach.
Prior to becoming a Davao-based satellite hub, the General Santos station operated as an originating station from 2010 to 2015. During that period, it produced localized programs such as SOCCSKSARGEN Isyu Karon and Flash Bulletin. However, following the centralization of regional operations, it was absorbed by GMA Davao. This resulted in the simulcast of One Mindanao and other regional interstitial segments. Many of the editorial and reportorial staff from General Santos were also integrated into GMA Davao's operations, especially as GMA General Santos was not re-upgraded to full originating status.
Similarly, GMA Cagayan de Oro operated as an originating station from 2010 to 2015, producing regional programs like Northern Mindanao Isyu Karon and Testigo Northern Mindanao (later rebranded as 24 Oras Northern Mindanao). These two were discontinued following the retrenchment, with GMA Cagayan de Oro being absorbed into GMA Davao’s network. Its programming was replaced with simulcasts of One Mindanao and related regional content, while a number of its staff were retained under GMA Davao.
Other stations, including those in Zamboanga City, Jolo, Sulu; Butuan, Cotabato City, Surigao City, and Tandag previously functioned as direct satellite relays of GMA-7 Manila. As of August 28, 2017, they were reassigned as relay stations under GMA Davao, further consolidating Mindanao operations.
The Zamboanga station was later upgraded to a semi-satellite station for Western Mindanao on October 14, 2021 (later closed in 2024), and the General Santos station followed as a semi-satellite station for South Central Mindanao on March 21, 2022.
During Typhoon Rai (Odette), its relay station in Surigao City was severely damaged and temporarily replaced with a small antenna within the transmission building.
