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A Question Of Navigation  
User currently offlineXxxx10 From United Kingdom, joined Jan 2000, 779 posts, RR: 0
Posted (15 years 4 months 1 week 2 hours ago) and read 1735 times:

Please can anyone help

Does anyone know how the early jet ailiners such as 737-200 ,727, fokker f28 & 1-11 navigate apart from using radio aids, are they now etro-fitted with gps?

If so does it just provide groundspeed and track information or can it give distance and bearing to the en-route waypoints.


6 replies: All unread, jump to last
User currently offlineFLY 8 From Austria, joined Dec 2000, 329 posts, RR: 0
Reply 1, posted (15 years 4 months 1 week 1 hour ago) and read 1681 times:

The early jets flew from navaid to navaid, and if the flew on an "selfmade" track they had to plot their position! Here in Europe, at least in Austria and Germany, you still have to learn plotting when you take your ATPL. On long range flights they had an IRS.
Today we don´t have an IRS but an INS!
Mainly there is the FMS (flight management system) and this gets it´s information from:

So if you have any questions about something else here, just ask me! If I would explain here the whole navigation stuff I would still sit around in a few days!!

Best regards,

yes i can handle that alone. - - -famous last words
User currently offlineModesto2 From United States of America, joined Jul 2000, 2898 posts, RR: 5
Reply 2, posted (15 years 4 months 6 days 6 hours ago) and read 1637 times:

FLY 8, could you explain: "Today we don´t have an IRS but an INS!"... I thought the IRS is an updated version of the INS that uses laser ring gyros... The 777's use GPS with multiple IRS backup.

User currently offlineN766AS From , joined Dec 1969, posts, RR:
Reply 3, posted (15 years 4 months 6 days 5 hours ago) and read 1627 times:

All's I know is the IRS takes my money and needs to be stopped...

User currently offlineFLY 8 From Austria, joined Dec 2000, 329 posts, RR: 0
Reply 4, posted (15 years 4 months 6 days ago) and read 1623 times:

Sorry, my mistake!

yes i can handle that alone. - - -famous last words
User currently offlineCdfMXTech From United States of America, joined Jul 2000, 1341 posts, RR: 24
Reply 5, posted (15 years 4 months 3 days 13 hours ago) and read 1594 times:

Order of navigation used on aircraft today:


GPS is the most accurate form used to navigate. The aircraft FMCS DOES NOT want to use Inertial Reference if it doesn't HAVE to because of its error rate.

User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 6, posted (15 years 4 months 3 days 6 hours ago) and read 1585 times:

Many operators in Canada still do not have anything other than basic VOR/ADF equipment in their aircraft, including (but now defunct) my past employer's Dash 8/BAe-146 operation.

LAR navigation is a most valuable skill once acquired, and can save your a** at some inoportune time when you least expect it/most need it.

Best Regards,


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