To Non-Java ALLSTAR Network Website

                                                                                                                                                                        JAVA-capable browser required for graphic-based menus (Exploer 3.0 or Netscape 2.0 or greater)

Please let me remind all of you--this material is copyrighted.  Though partially funded by NASA, it is still a private site.  Therefore, before using our materials in any form, electronic or otherwise, you need to ask permission.
There are two ways to browse the site: (1) use the search button above to find specific materials using keywords; or,
(2) go to specific headings like history, principles or careers at specific levels above and click on the button.
Teachers may go directly to the Teachers' Guide from the For Teachers button above or site browse as in (1) and (2).

FAQnewred.gif (906 bytes)           

Horizontal Situation Indicator (HSI)

jet_line.gif (1450 bytes)

The HSI provides a basic horizontal view of the aircraft's navigation picture. In the F-15E, it can provide navigation data to selected ground navigation facilities (TACAN or Instrument Landing System (ILS)) or to onboard navigation systems like the Inertial Navigation System (INS).

Instrument flying without an HSI requires a fair amount of mental gymnastics; for this reason, the HSI is becoming more prevalent in general aviation since it provides an excellent picture for precise navigation.

The electronic HSI in the F-15E provides a wealth of information. In the example below, the HSI provides the crew with the bearing and range to the selected TACAN (a ground based navigation instrument that transmits a signal 360 degrees from the station) is 305 degrees and 16.0 miles (the time required to fly to the TACAN is 2 minutes and 20 seconds); the bearing and distance to the point the INS is steering to is 105 degrees and 12 miles (the time required to fly to the INS steering point is 1 minute and 48 seconds).

TACAN                    INS
    data                      data

The basis for this section is the Flight Training Manual by Transport Canada.   However, the text was modified for US users and readers by Dr. Claudius Carnegie of the ALLSTAR website.  Tables and/or pictures were unchanged.  Any questions should be directed to Dr. Carnegie at directly.

Send all comments to
1995-2018 ALLSTAR Network. All rights reserved worldwide.

Funded in part by Used with permission from
90th Fighter Squadron
"Dicemen" Aviation
wpe1B.jpg (2191 bytes)

Updated: March 12, 2004