README25.TXT                WinOrbit 2.5               5 May 95

Read the file "README.TXT" first

Bug Fixes and changes in 2.5
----------------------------
- "Next Pass" now determined based on present UTC, not 
    local (CPU) clock time.
- Fixed the "resume without error" bug in Print Ephemeris
    when not printing to a file.
- If map (land/ocean) colors are changed, it is no longer
    necessary to "clear display" in each map after 
    restarting the program.
- Observer QTH now displays properly in the Main window.
- Help file displayed automatically if .INI file is not 
    current. 

Major Improvements in 2.4
-------------------------
- "View from Space" available (slow - not in real time).
- Sun and terminator line now move automatically in real
      time (if displayed)
- Fixed European (esp. German) number format bug (",").
- Print to File option for ephemerides. 

Major Improvements in 2.3
-------------------------
- Every satellite in file now available for printing (not 
      just the currently-tracked set).
- Function keys can be used for some common operations.
- Choice of 4 orbit-calculation algorithms.
- Display of additional observer locations for mutual
      visibility
- Grid locators for observer location entry (or calc from
      lat and long automatically)
- Display of solar position and terminator for eclipse 
      determination.
- Pop-up window to show elements, next pass, and other info.
- Additional ephemeris options including EQX, timeline.
- Print preferences now saved.
- Selectable colors for ocean and land on the map.
- Additional Items for DDE clients.
- Keplerian element computation features (propagate elements,
      change RAAN for delayed launch, etc.).

Other Changes in 2.3
--------------------
- Numerous bug fixes.  I hope the program will now work with
      ANY date and time format.
- Improved checking of data entry to avoid illegal values which
      might crash the program.
- Some rearrangement and renaming of menu items.
- More (and better ?) error messages.
- Map changed from 1- to 8-bit bitmap (hope this fixes the 32k-
      color display problem)

Improvements in 2.2
-------------------
- Added DDE interface for antenna-pointing systems.  See "Help".
- Extensively revised help file.
- Improved table printouts
- Minor changes to menus


Improvements in 2.1
-------------------
- User-specified colors for some map features
- Sidereal time offset now calculated from 4-parameter model
     instead of fixed value (errors reduced from 3 min to < 1 
     sec).
- Numerous changes to improve the user interface (menus, etc.)
- Setup menu now permits specifying an offset between computer
  clock and UTC (formerly required computer to be set to UTC)
- Improved handling of satellite files/lists and observer files/
     lists
- observer file LATLONG.QTH now included (list by ITU radio 
     prefix).
- Fixed bugs in resizing of map windows.
- Permit keeping just one map window visible
- European date format now works (formerly crashed on startup)