Question:
ZZ Top  is an American rock band formed in 1969 in Houston, Texas. The band has, since 1970, consisted of bassist and lead vocalist Dusty Hill, guitarist and lead vocalist Billy Gibbons (the band's leader, main lyricist and musical arranger), and drummer Frank Beard. "As genuine roots musicians, they have few peers", according to former musician, critic and collector Michael "Cub" Koda. "Gibbons is one of America's finest blues guitarists working in the arena rock idiom [...] while Hill and Beard provide the ultimate rhythm section support."
ZZ Top's next album was even more successful. Eliminator, released in March 1983, featured two top 40 singles ("Gimme All Your Lovin'" and "Legs"), and two additional Top Rock hits ("Got Me Under Pressure" and "Sharp Dressed Man"), with "Legs" peaking at no. 13 on the Club Play Singles chart. Eliminator was a critical and commercial success, selling more than 10 million copies, and several music videos were in regular rotation on MTV. The band also won their first MTV Video Music Awards in the categories of Best Group Video for "Legs", and Best Direction for "Sharp Dressed Man". The music videos were included in their Greatest Hits video, which was later released on DVD and quickly went multiple-platinum. However, the Eliminator album was not without controversy. According to former stage manager David Blayney in his book "Sharp Dressed Men", sound engineer Linden Hudson co-wrote much of the material on the album while serving as a live-in high-tech music teacher to Beard and Gibbons. Despite continued denials by the band, it settled a five-year legal battle with Hudson, paying him $600,000 after he proved he held the copyright to the song "Thug".  Despite not selling as many copies as Eliminator, 1985's Afterburner became the band's highest-charting album, racking up sales of five million units. All of the singles from Afterburner were Top 40 hits, with two ("Sleeping Bag" and "Stages") hitting no. 1 on the Mainstream Rock chart. The music video for "Velcro Fly" was choreographed by pop singer Paula Abdul. ZZ Top's grueling Afterburner World Tour lasted well into 1987, which also saw the release of The ZZ Top Sixpack, a three-disc collection of ZZ Top's albums from 1970 to 1981, with the exception of Deguello. The albums ZZ Top's First Album, Rio Grande Mud, Tres Hombres, Fandango, and Tejas were remixed to have a more contemporary sound.  Recycler, released in 1990, was ZZ Top's last studio album under contract with Warner Records. Recycler was also the last of a distinct sonic trilogy in the ZZ Top catalogue, marking a return towards a simpler guitar-driven blues sound with less synthesizer and pop bounce than the previous two albums. This move did not entirely suit the fan base that Eliminator and Afterburner had built up, and while Recycler did achieve platinum status, it never matched the sales of those albums.
Answer this question using a quote from the text above:

What albums were released during this time?

Answer:
Eliminator,


Question:
Zheng He (Chinese: Zheng He ; 1371-1433 or 1435) was a Chinese mariner, explorer, diplomat, fleet admiral, and court eunuch during China's early Ming dynasty. He was originally born as Ma He in a Muslim family, later adopted the conferred surname Zheng from Emperor Yongle. Zheng commanded expeditionary voyages to Southeast Asia, South Asia, Western Asia, and East Africa from 1405 to 1433. His larger ships stretched 120 meters or more in length.
Zheng He's sailing charts, the Mao Kun map, were published in a book entitled the Wubei Zhi (A Treatise on Armament Technology) written in 1621 and published in 1628 but traced back to Zheng He's and earlier voyages. It was originally a strip map 20.5 cm by 560 cm that could be rolled up, but was divided into 40 pages which vary in scale from 7 miles/inch in the Nanjing area to 215 miles/inch in parts of the African coast.  Investigation into folios 19V to 20R of the Mao Kun Map which covers the Indian Ocean including the South India, Sri Lanka, the Maldives, and East Africa suggests that it is a composite of four maps, one for Sri Lanka, one for South India one for the Maldives and one for around 400 km of the East African coast, no further south than 6 degrees south of the Equator. Each of these maps is positioned at a different orientation to fit with the ocean currents and winds required of a sailing chart, rather than a formal map. The analysis also suggests that Arabic-speaking pilots with a detailed knowledge of the African coast were involved in the cartography.  There is little attempt to provide an accurate 2-D representation; instead the sailing instructions are given using a 24-point compass system with a Chinese symbol for each point, together with a sailing time or distance, which takes account of the local currents and winds. Sometimes depth soundings are also provided. It also shows bays, estuaries, capes and islands, ports and mountains along the coast, important landmarks such as pagodas and temples, and shoal rocks. Of 300 named places outside China, more than 80% can be confidently located. There are also fifty observations of stellar altitude.
Answer this question using a quote from the text above:

Are his charts still used today?

Answer: