david b.
Topic Author
Posts: 2894
Joined: Fri Jun 15, 2001 7:18 pm

What does the number in the navigation screen, top right hand conor mean? The lower number is Nautical miles to the waypoint, the time is above in Zulu time but why is there a decimal point in there?

0446.6Z is displayed

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Teenage-know-it-alls should be shot on sight

shaun3000
Posts: 439
Joined: Thu Mar 14, 2002 4:10 pm

I'm guessing time in 24 hour Zulu format...

b767-400er
Posts: 384
Joined: Wed Apr 05, 2000 11:07 am

It's the ETA for that specific waypoint, in this case KADUN. The dot simply means a fraction less then a minute. From this pic
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we can see the ETA for the next waypoint is 0501z.

Cheers
Tony,
B767-400er

Guest

Tony's correct. Here's a question, what time was the picture taken (UTC)?

b767-400er
Posts: 384
Joined: Wed Apr 05, 2000 11:07 am

Since it appears that they have just passed, or is exactly at the previous waypoint, I'd say 0421z. 25 minutes for 214nm sounds reasonable. However, since the ND is at 160nm, a little off on the screen can be miles off, so this is pure guess.

Tony,
B767-400er

Guest

The information to figure it out exactly what time each of the pictures was taken is on the display. Think about it a bit more...

PW4084
Posts: 287
Joined: Tue Mar 06, 2001 7:31 pm

### Time

Jetguy,

I'd say Tony is pretty close.
I used the GS readout from both displays and worked the problem

Pilot ND: 532 Knots GS/207 NM from KADUN/23.5 minutes to KADUN/ KADUN ETA of 0446.3Z = photo time of ~0422.8Z

Co-Pilot ND: 525 Knots GS/214 NM from KADUN/24.3 minutes to KADUN/ KADUN ETA of 0446.5Z =photo time of ~0422.3 Z

Using those figures I'd predict the pictures were taken about 30-40 seconds apart.

However, if you average the ground speeds you get 529 knots... that equates to 8.8 miles/minute....the two pictures are 7 miles apart which equates to 48 seconds

Anyone get anything different, I'm probably missing something.

Guest

Dan,
Tony was close, but as he said, his answer was a pure guess. Lucky guesses don't count. You worked the problems the way I did and came up with the same answers. Anyone who agrees with me has to be right!
Jetguy

PW4084
Posts: 287
Joined: Tue Mar 06, 2001 7:31 pm

Jetguy,

I'll take any chance to get out the good old whiz wheel and practice a little. Those skills are definitely perishable but come back with some tinkering.... I wonder what the future of the whiz wheel is when even rental C-172s have Garmin GNS430s.

Dan

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