The _Sport Model_ consists of plain-vanilla FlightGear Flight Simulator plus some extensions and improvements. Here is a partial list of the features pioneered by the _Sport Model_. (Note that a few of them have since been merged back into vanilla FGFS. Alas, only a few.) 1:: Gremlins cause instruments and systems to fail at random times. The pilot gets to choose the MTBF. 2:: On the HSI, the heading card stops turning when "directional gyro" is not serviceable. (This is the hsi as used in the c182 and many other light aircraft.) 3:: On the HSI, the GS needle goes to the top (not the middle) when not serviceable. The vanilla FGFS behavior was a pilot-killer. 4:: On the HSI, the GS needle shows a flag (barber pole) when not serviceable. The vanilla FGFS was a pilot-killer. 5:: On the HSI, the CDI needle shows a flag when not serviceable. The previous behavior was a pilot-killer. 6:: On the plain Nav head, the GS needle shows a flag when not serviceable. The vanilla FGFS was a pilot-killer. 7:: On the plain Nav, the head CDI needle shows a flag when not serviceable. The vanilla FGFS was a pilot-killer. 8:: AWOS is available at AWOS locations. (Previously only ATIS was implemented.) 9:: ATIS phraseology now more nearly conforms to international standard METAR pattern, and therefore to usual FAA practice.(*) Items marked with a (*) are fully implemented in the /text/ of the ATIS message, but the voiced version of the message is degraded by limitations of the FGFS built-in text-to-speech system. 10:: ATIS now reports sky condition.(*) 11:: ATIS now reports multiple layers of clouds, not just the lowest layer.(*) 12:: ATIS now takes field elevation into account when calculating sky condition and ceiling. 13:: ATIS now reports dewpoint.(*) 14:: ATIS now can handle negative quantities (temperature and dewpoint).(*) 15:: ATIS can now report report fractional-mile visibility.(*) 16:: ATIS now uses magnetic (not true) wind directions, as it should. 17:: ATIS generates correct runway number and suffix (nine right, one one left). 18:: ATIS can be received on nav frequencies, not just comm. 19:: Nothing bad happens if the same ATIS is tuned up on more than one receiver. 20:: ATIS can be updated at times other than at the top of the hour. 21:: ATIS listens for an "attention" signal, and responds to changes in the weather by issuing a new ATIS message (somewhat like a "special observation"). 22:: ATIS volume now responds to radio volume setting. 23:: Area-related services (i.e. approach radar) are handled more-nearly consistently with radio-frequency related services. 24:: ATIS sequence-letter generation has been fixed. 25:: ATIS messages are now in the property tree, so they can be read e.g. via the http interface. 26:: The "clock" in the panel (as used in the default C172 and many other GA aircraft) can now be used as a resettable timer. Among other uses, this is useful for timing approaches. 27:: In the ambient pressure profile (which is the basis of aircraft altimetry), non-ISA temperature and pressure are supported, as required by the laws of physics. 28:: The altimeter now works up to much higher altitudes. 29:: Many enhancements to the X52 joystick interface. See Docs/README.X52 30:: The location-in-air popup can now be used without trashing your settings. (Previously it trashed elevator trim, aileron trim, elevator trim, rudder trim, view angles, PoV position, landing gear, throttle setting, and who-knows-what-all else.) See README.location-in-air 31:: Since navaid 3-letter IDs are not unique, the navaid finder (used for initial positioning, as well as for location-in-air) will take you to the /nearest/ one, not some random one. 32:: Navaid names may now be entered without regard to upper case or lower case. 33:: The system implements more-realistic navaid service volumes, including expanded localizer volumes at selected stations. 34:: The system implements false localizer courses abeam the antenna, as there are in real life. 35:: There is a popup to show the position of flight controls and trim. This is a workaround for use in the many aircraft that still lack usable trim indicators. 36:: In the Clouds popup, there is a "Plus/Minus" field that the pilot can use to create a ceiling with some uncertainty. See Docs/README.clouds for instructions on using this feature. 37:: The FG HSI instrument now has a double-shafted ADF(RMI) needle, as shown here: http://www.av8n.com/fly/fgfs/RMI.jpg which is more nearly like a real-world HSI/ADF(RMI). In contrast, heretofore on the model HSI, the tip of the ADF (RMI) needle looked a whole lot like the tip of the VOR needle. This made it much too easy for the pilot to follow the wrong needle. ========================= The remaining items are more of interest to programmers than to pilots: 38:: The --prop command-line option now defaults to giving things UNSPECIFIED type, not string type, so that the type can later be changed (once). 39:: Some ATIS-related memory leaks have been fixed. 40:: ATCmgr and the associated data structures have been reorganized so that -- we can have some number of radios other than 2 -- information needed by ATC objects is stored where it is needed (in the objects) rather than in useless arrays in ATCmgr. 41:: The code in ATCmgr has been made much shorter and more regular. 42:: We use calculated (not guessed) length for some buffers. Use automatic variables rather than "new" and "delete". 43:: Some thread-unsafe code has been fixed.