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Hi :
I too just (Dec2007) found a similar error in using the navigational module
in my 20+ year old hP41CX calculator ...one never knows..so alternates are a
must.
Irv

-----Original Message-----
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf
Of Dan Allen
Sent: January 9, 2008 11:30 AM
To: NavList
Subject: [NavList 4389] Boundary error case


The Lockheed Martin F-22 Raptor fighter about a year ago hit an interesting
bug in the navigation software, something we should all be aware of when
writing navigation software.

This brief excerpt is from Wikipedia
():

---

While attempting its first overseas deployment to the Kadena Air Base in
Okinawa, Japan, on 11 February 2007, a group of six Raptors flying from
Hickam AFB experienced multiple computer crashes coincident with their
crossing of the 180th meridian of longitude (the International Date Line).
The computer failures included at least navigation (completely lost) and
communication. The fighters were able to return to Hawaii by following their
tankers in good weather. The error was fixed within 48 hours and the F-22s
continued their journey to Kadena.
[47][48]

---

That's a fast turnaround time on a bug fix in the military world!

Beware the 180th meridian!

Dan






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