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Garmin GPS 72 GPS Receiver

GPS Problem solving skills


By M0nica L - usenet poster


I couldn't resist,
Here is a Ministry of Defence picture of the GPS receiver (eTrex
Legend) a British soldier was holding on a helicopter over the
merchant ship their comrades were captured on:
#
The article that references this picture states that is was taken on
Sunday morning, March 25th - two days after the incident - but they
don't say when.
Looking at the picture only, can you tell what time the picture was
taken?
Hints:
Garmin lists their satellites in numerical order across the bottom of
this screen - though some are hard to make out, they can be inferred.
The local time there is UTC +3 (or +3:30 if you think their they're in
Iranian waters)
I think I got it to within 15-20 minutes...
T. Driver
I have the same problem.
This Problem has been added to the Share Your Expertise Page under "My Work Queue".

Solution #1

posted on Aug 01, 2007
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Melissa

Rank:Apprentice Apprentice
Rating: 0%, 0 votes
I also got between 5:51 and 6:14 GMT. The satellite's (s)he's
tracking are: 5,6,7,18,21 and 30. (S)He's also tracking 22, but
hasn't acquired all the data to use it in a nav solution yet. Looking
at the EXIF information is something I didn't think about Sam, bravo!
Unfortunately it's not from the day of the photograph.
Great job guys!
Ted
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Solution #2

posted on Aug 01, 2007
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Joey2

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That was my initial assumption too, nice!
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Solution #3

posted on Aug 01, 2007
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Horner

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Here's the data from the image at the url, which is nothing more
than the time that *this* image was last manipulated/written by
Adobe Photoshop 7.0.

Exif header 4411 bytes long
Exif section in Motorola order
(dir has 7 entries)
Orientation = 1
XResolution = 72/1
YResolution = 72/1
ResolutionUnit = 2
Software = "Adobe Photoshop 7.0"
DateTime = "2007:03:28 09:54:36"
ExifOffset = 156
Exif Dir:(dir has 3 entries)
ColorSpace = 65535
ExifImageWidth = 800
ExifImageLength = 594
Continued directory (dir has 6 entries)
Compression = 6
XResolution = 72/1
YResolution = 72/1
ResolutionUnit = 2
ThumbnailOffset = 294
ThumbnailLength = 4109
Thumbnail size: 4109 bytes
Non settings part of Exif header: 4109 bytes
Jpeg section marker 0xed size 5586
Jpeg section marker 0xee size 14
Jpeg section marker 0xdb size 132
JPEG image is 800w * 594h, 3 color components, 8 bits per sample
Jpeg section marker 0xdd size 4
Jpeg section marker 0xc4 size 418
File name : HeloGPS.jpg
File size : 77561 bytes
File date : 2007:03:28 05:29:20
Date/Time : 2007:03:28 09:54:36
Resolution : 800 x 594

There is no date displayed on the GPS receiver
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Solution #4

posted on Aug 01, 2007
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kcw573

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Oops. Make that "Track Up"
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Solution #5

posted on Aug 01, 2007
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jessie25

Rank:Apprentice Apprentice
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Cool. Since the satellite view is "North Up", it's clear the helicopter is
traveling ESE, and from the satellite distribution, the crewman is probably on
the starboard side, facing south.
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Solution #6

posted on Aug 01, 2007
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LiZzIe

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...

Using just satellites 21,22, and 30 I got about 0600 GMT using Trimble's
planning SW. I felt fairly confident that I could read those satellite
numbers from the image.

For those interested the Trimble SW is free and available here:
#

Don't forget to also DL the ephemeris file! Then start the SW, go to the
menu Almanac/Load, and load it.

Thanks to Trimble for making this nice SW freely available.
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