My instructor explained that the Dan Tien is about 2 inches below the navel. And from your description, it appears it is over the manipura and anahata chakras (navel and heart center).
You are describing the position of the lower tan tien . This is male in nature and is clairvoyantly viewed as red . I have not heard it called the Dan Tien before . There is an image at this link lableing the locations as lower , middle and upper tan tiens ;
http://www.kheper.net/topics/Taoism/tan_tiens.jpg
Mantak Chia describes the lower tan tien as ;
the "Medicine Field" as well as "the Elixir Field", as it gathers and contains the healing power of the Original Chi or Prenatal Energy. Other names for it are the Ocean of Chi, the Sea of Energy, the cauldron and the navel center. The use of the expressions "Ocean" and "Sea" refer to the wavelike quality of Chi. The cauldron and the navel belong to the lower Tan Tien. The expression "cauldron" refers to the function of the lower Tan Tien as the chief laboratory and center of internal alchemy which transforms energy frequencies.
The Lower Tan Tien serves as the source of the life force or vital force which then as Chi becomes the source of Shen Chi or spirit power/energy.
Thus, throughout all Universal Tao practices including the highest ones, the Lower Tan Tien remains the key to opening the body and the mind for a free uninterrupted energy flow.
http://www.universal-tao.com/ book/
http://www.universal-tao.com/article/three_minds.html
But , there is confusion over the term , you are correct . It is used to denote a specific tan tien and it is also used as a spelling variant .Upon further research I find the upper tan tien and the middle tan tien have both been called the Dan Tien and you indicate your instructor called the lower tan tien the Dan Tien also . And with a bit of googling it is apparent that instructors do call the entire set Dan Tiens as you say . No wonder students get confused , lol .
Here are some links showing the discrepancy which you have pointed out to me , thank you ;
The upper Tan Tien or Dan Tien comes ...
http://www.uechi-ryu-journal.com
The abdominale DAN TIEN.
http://www.taijiqigong.com
The Three Tan TiensThree Dan Tien Balancing. Check the upper, middle and lower tan tiens. Balance each tan tien. Use clockwise circles and pushing/pulling motions directly ...
home.xtra.co.nz/hosts/Wingmakers/ The%20Tan%20Tien_Hara%20Line.html
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