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User currently offlineDavid B. From United States of America, joined Jun 2001, 3148 posts, RR: 5
Posted (11 years 10 months 1 week 3 days 22 hours ago) and read 970 times:

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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Photo © Frank Schaefer




Teenage-know-it-alls should be shot on sight
8 replies: All unread, jump to last
 
User currently offlineShaun3000 From United States of America, joined Mar 2002, 445 posts, RR: 0
Reply 1, posted (11 years 10 months 1 week 3 days 21 hours ago) and read 946 times:

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

User currently offlineB767-400er From Hong Kong, joined Apr 2000, 290 posts, RR: 1
Reply 2, posted (11 years 10 months 1 week 3 days 19 hours ago) and read 931 times:

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


User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 3, posted (11 years 10 months 1 week 3 days 19 hours ago) and read 929 times:

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

User currently offlineB767-400er From Hong Kong, joined Apr 2000, 290 posts, RR: 1
Reply 4, posted (11 years 10 months 1 week 3 days 18 hours ago) and read 921 times:

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


User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 5, posted (11 years 10 months 1 week 3 days 18 hours ago) and read 919 times:

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...


User currently offlinePW4084 From United States of America, joined Mar 2001, 291 posts, RR: 0
Reply 6, posted (11 years 10 months 1 week 3 days 17 hours ago) and read 915 times:

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  Smile

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


User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 7, posted (11 years 10 months 1 week 3 days 9 hours ago) and read 888 times:

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!  Big thumbs up
Jetguy


User currently offlinePW4084 From United States of America, joined Mar 2001, 291 posts, RR: 0
Reply 8, posted (11 years 10 months 1 week 2 days 22 hours ago) and read 849 times:

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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