The radar contacts of one F-16 with the so-called "UFOs" have been
registered on a video record. One lasted for 46 seconds. Two F-16
were involved. One of the F-16 had 13 registered contacts; the other
one had also contacts, but they were not registered because the
pilot did not push the right switch. The contacts can be divided
into 5 groups, separated by periods without contact.

contact     lasting       beginning
number      (seconds)     at
     1          2.3         00 h 13 March 31,1990 (March 30 22 h 13 GMT)
     2          3.4

     3         19.9         00 h 15

     4         27.5         00 h 29
     5          8.0
     6         11.4
     7          9.3
     8        < 0.1

     9         45.9         00 h 39
    10         16.2
    11         11.4
    12          9.5

    13         11.2         00 h 46

All positions and speeds are available on the video record. Speeds
of vertical displacement seem to be sometimes above 1000 knots.
Measured speeds are digitally displayed with only three numbers, so
200 knots could be 1200 or 2200 knots. Knowing that, positions and
speeds can be correlated (however, above 1000 knots, the three last
digits are dubious).

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Here is the transcript of one of the contacts:

 Seconds after    Heading                    Speed    Altitude
   lock-on       (degrees)                  (knots)    (feet)

      00            200                       150       7000
      01            200                       150       7000
      02            200                       150       7000
      03            200                       150       7000
      04      sharp 200          acceleration 150       6000
      05       turn 270             = 22 g    560       6000
      06            270                       560       6000
      07            270                       570       6000
      08            270                       560       7000
      09            270                       550       7000
      10            210                       560       9000
      11            210                       570      10000
      12            210                       560      11000
      13            210                       570      10000
      14            270                       770       7000
      15            270                       770       6000
      16            270                       780       6000
      17            270                       790       5000
      18            290                      1010       4000
      19            290                      1000       3000
      20            290                       990       2000
      21            290                       990       1000
      22            300                       990       0000
      22.5          300                       980       0000  Break lock

When you see for example altitude 5000, this means between 4500 and 5500.
So 0000 means between 0 and 500. 0 is sea level; mean ground altitude
in this area is about 200 feet (therefore 0000 means in fact between
200 and 500).