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Memory Map and GPX

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General fitness, health and nutrition
Published
9 June 2007
Last activity
26 June 2007
Original author
Terry Pinnell
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15
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  1. Hoping there might be a few Memory-Map users here who can confirm my
    interpretation of a few points please. (I've posted to the Memory-Map
    internal forum, but typically it takes 4 days to get a response.)

    I downloaded a tracklog of a UK walk from my Garmin GPS 12 and, using
    other software, saved it as a GPX file. I imported that into
    Memory-Map. If I move the mouse cursor over the map I can now see the
    time I was at each trackpoint. Good, exactly what I want, as I'm
    playing with geo-tagging my walk photos, and find I often need to know
    when I was at a particular place, to match it with EXIF data from my
    camera.

    But the bad news is that I've just discovered that this time will
    change, depending on whether I'm using Memory-Map in summer or winter!
    IOW, if I were to view this same walk next winter, I think all the
    times would be 1 hour behind?

    As I understand it, this arises because of two factors:

    1) GPX files have no knowledge of local times. So they will always use
    the UTC (GMT) times recorded by the GPS unit. Regardless of what
    software is used to save them. My walk was in summer, starting at
    09:30, but the first trackpoint in the GPX files is 08:30, viewed in
    my text editor. No information about offsets or zones is present in
    the file.

    2) But Memory-Map apparently adjusts this according to the time zone
    set on my PC. So today, in British Summer Time (BST), the mouse cursor
    shows the first trackpoint as 09:30, *apparently* the correct local
    time. But if I re-open this overlay in December, it will show the
    start as 08:30.

    Seems very confusing. I'd have thought it would be much better to
    avoid such ambiguity if Memory-Map consistently displayed the data
    actually in the GPX file, i.e UTC (GMT). But maybe I'm missing
    something?

    --
    Terry, West Sussex, UK

    --
    Terry, West Sussex, UK


  2. Quoted message said:


    Seems very confusing. I'd have thought it would be much better to
    avoid such ambiguity if Memory-Map consistently displayed the data
    actually in the GPX file, i.e UTC (GMT). But maybe I'm missing
    something?

    Don't have Memory Map but it looks like it only reads system clock. A fix
    (but admitedly not a good one) is to disable the auto adjust to local time
    in system clock whilst using Multimap in BST. Double click on time bottom
    right in toolbar. Choose time zone tab - untixk automatically adjust cloct
    for daylight saving changes. Don't forget to put it back when finished :-)

    Roger

  3. Roger G4OWG said:


    Quoted message said:


    Seems very confusing. I'd have thought it would be much better to
    avoid such ambiguity if Memory-Map consistently displayed the data
    actually in the GPX file, i.e UTC (GMT). But maybe I'm missing
    something?

    Don't have Memory Map but it looks like it only reads system clock. A fix
    (but admitedly not a good one) is to disable the auto adjust to local time
    in system clock whilst using Multimap in BST. Double click on time bottom
    right in toolbar. Choose time zone tab - untixk automatically adjust cloct
    for daylight saving changes. Don't forget to put it back when finished :-)

    Roger

    Thanks Roger. But sooner or later I know I *would* forget to change it
    back! And anyway, I make frequent use of that clock in the tray. So
    I'll live with the Memory-Map inconsistency, I guess. Maybe add a text
    marker to the map (and remember to display it - it's not automatic)
    showing the track's actual start time in local time.

    Do other map programs like Tracklog, Anquet, etc, do the same with GPX
    files?

    --
    Terry, West Sussex, UK

  4. Terry Pinnell said:
    Roger G4OWG said:
    Quoted message said:

    Seems very confusing. I'd have thought it would be much better to
    avoid such ambiguity if Memory-Map consistently displayed the data
    actually in the GPX file, i.e UTC (GMT). But maybe I'm missing
    something?


    Don't have Memory Map but it looks like it only reads system clock. A fix
    (but admitedly not a good one) is to disable the auto adjust to local time
    in system clock whilst using Multimap in BST. Double click on time bottom
    right in toolbar. Choose time zone tab - untixk automatically adjust cloct
    for daylight saving changes. Don't forget to put it back when finished :-)

    Roger

    Thanks Roger. But sooner or later I know I *would* forget to change it
    back! And anyway, I make frequent use of that clock in the tray. So
    I'll live with the Memory-Map inconsistency, I guess. Maybe add a text
    marker to the map (and remember to display it - it's not automatic)
    showing the track's actual start time in local time.

    Do other map programs like Tracklog, Anquet, etc, do the same with GPX
    files?


    Does your GPS have the facility (60CSX does) to make marks? If so that
    is what I do when I take a photo, I can then cross check that mark and
    the photo against the time, then make a simple chart cross referencing
    photos and marks.

  5. Broadback said:
    Terry Pinnell said:
    Roger G4OWG said:

    > Seems very confusing. I'd have thought it would be much better to
    > avoid such ambiguity if Memory-Map consistently displayed the data
    > actually in the GPX file, i.e UTC (GMT). But maybe I'm missing
    > something?
    Don't have Memory Map but it looks like it only reads system clock. A fix
    (but admitedly not a good one) is to disable the auto adjust to local time
    in system clock whilst using Multimap in BST. Double click on time bottom
    right in toolbar. Choose time zone tab - untixk automatically adjust cloct
    for daylight saving changes. Don't forget to put it back when finished :-)

    Roger

    Thanks Roger. But sooner or later I know I *would* forget to change it
    back! And anyway, I make frequent use of that clock in the tray. So
    I'll live with the Memory-Map inconsistency, I guess. Maybe add a text
    marker to the map (and remember to display it - it's not automatic)
    showing the track's actual start time in local time.

    Do other map programs like Tracklog, Anquet, etc, do the same with GPX
    files?


    Does your GPS have the facility (60CSX does) to make marks? If so that
    is what I do when I take a photo, I can then cross check that mark and
    the photo against the time, then make a simple chart cross referencing
    photos and marks.

    Yes, I can do that, although I normally just rely on the recorded
    track, which I plot after all walk. But as mentioned, I'm now into
    geo-tagging, i.e. automatically adding lat/lon to my photos' EXIF
    data.

    --
    Terry, West Sussex, UK

  6. Terry Pinnell said:

    Yes, I can do that, although I normally just rely on the recorded
    track, which I plot after all walk. But as mentioned, I'm now into
    geo-tagging, i.e. automatically adding lat/lon to my photos' EXIF
    data.

    How do you do that automatically? Have you got some software to do it?

    Paul
    --
    http://www.wilderness-wales.co.uk/
    http://www.wilderness-wales.co.uk/weblog/

  7. Paul Saunders said:
    Terry Pinnell said:

    Yes, I can do that, although I normally just rely on the recorded
    track, which I plot after all walk. But as mentioned, I'm now into
    geo-tagging, i.e. automatically adding lat/lon to my photos' EXIF
    data.

    How do you do that automatically? Have you got some software to do it?

    Yes, I discovered a brilliant program last week called gpicsync,
    written by Francois Schnell. See here:
    http://groups.google.com/group/gpicsync

    I installed 0.98 less than a week ago, and this morning ran version
    1.02!

    --
    Terry, West Sussex, UK

  8. Terry Pinnell said:

    Broadback <[email hidden]> wrote:

    Quoted message said:
    Quoted message said:
    Terry Pinnell said:

    "Roger G4OWG" <[email hidden]> wrote:

    >> Seems very confusing. I'd have thought it would be much better to
    >> avoid such ambiguity if Memory-Map consistently displayed the data
    >> actually in the GPX file, i.e UTC (GMT). But maybe I'm missing
    >> something?
    > Don't have Memory Map but it looks like it only reads system clock. A fix
    > (but admitedly not a good one) is to disable the auto adjust to local time
    > in system clock whilst using Multimap in BST. Double click on time bottom
    > right in toolbar. Choose time zone tab - untixk automatically adjust cloct
    > for daylight saving changes. Don't forget to put it back when finished :-)
    >
    > Roger

    Thanks Roger. But sooner or later I know I *would* forget to change it
    back! And anyway, I make frequent use of that clock in the tray. So
    I'll live with the Memory-Map inconsistency, I guess. Maybe add a text
    marker to the map (and remember to display it - it's not automatic)
    showing the track's actual start time in local time.

    Do other map programs like Tracklog, Anquet, etc, do the same with GPX
    files?


    Does your GPS have the facility (60CSX does) to make marks? If so that
    is what I do when I take a photo, I can then cross check that mark and
    the photo against the time, then make a simple chart cross referencing
    photos and marks.

    Quoted message said:

    Yes, I can do that, although I normally just rely on the recorded
    track, which I plot after all walk. But as mentioned, I'm now into
    geo-tagging, i.e. automatically adding lat/lon to my photos' EXIF
    data.

    Really you need two -- one for where the camera was, the other for
    where the subject of the picture is. Otherwise photographing one
    mountain from the top of another gets a bit confusing. I'd also prefer
    the option to use local mapping grids, such as OS in the UK, rather
    than Lat Long.

    --
    Chris Malcolm [email hidden] DoD #205
    IPAB, Informatics, JCMB, King's Buildings, Edinburgh, EH9 3JZ, UK
    [http://www.dai.ed.ac.uk/homes/cam/]

  9. Terry Pinnell said:
    Paul Saunders said:
    Terry Pinnell said:

    Yes, I can do that, although I normally just rely on the recorded
    track, which I plot after all walk. But as mentioned, I'm now into
    geo-tagging, i.e. automatically adding lat/lon to my photos' EXIF
    data.

    How do you do that automatically? Have you got some software to do it?

    Yes, I discovered a brilliant program last week called gpicsync,
    written by Francois Schnell. See here:
    http://groups.google.com/group/gpicsync

    I installed 0.98 less than a week ago, and this morning ran version
    1.02!

    Im excited by the prospect of installing this when I get back from
    Alnwick in one week but I believe my excitment shall be short lived.
    On my etrex legend it saves times in the tracklog data which is ok for
    1 walk but when I go to alnwick Ill be saving each track as I go along
    and Ive noticed there isn't any time data in the saved tracks on the
    GPS. Can this program be used with the EL on more than one track.
    --
    Gwyn. [email hidden]
    Remove rem if replying
    note return address is your own computer;-)

  10. Gwyn said:
    Terry Pinnell said:

    Yes, I discovered a brilliant program last week called gpicsync,
    written by Francois Schnell. See here:
    http://groups.google.com/group/gpicsync

    I installed 0.98 less than a week ago, and this morning ran version
    1.02!

    Im excited by the prospect of installing this when I get back from
    Alnwick in one week but I believe my excitment shall be short lived.
    On my etrex legend it saves times in the tracklog data which is ok
    for 1 walk but when I go to alnwick Ill be saving each track as I
    go along and Ive noticed there isn't any time data in the saved
    tracks on the GPS. Can this program be used with the EL on more
    than one track.

    I have been trying this one out for the past few weeks.

    http://www.br-software.com/pixgps.html

    To get round the track saving problem I save the track but leave the
    'live' track running and use this for geomarking any pictures. I am
    using a garmin Etrex Legend C. (I still haven't quite got the hang of
    it yet though 🙂 )

    --

    Don`t Worry, Be Happy

    Sandy
    --

    E-Mail:- [email hidden]
    Website:- http://www.ftscotland.co.uk
    Looking for a webhost? Try http://www.1and1.co.uk/?k_id=2966019
    Fishing Wild at http://www.wild-fishing-scotland.co.uk/

  11. Sandy Birrell said:

    To get round the track saving problem I save the track but leave the
    'live' track running and use this for geomarking any pictures. I am
    using a garmin Etrex Legend C. (I still haven't quite got the hang of
    it yet though 🙂 )

    Thanks for that I will do that and I'll have a go when I come back
    next week.
    --
    Gwyn. [email hidden]
    Remove rem if replying
    note return address is your own computer;-)

  12. Gwyn g@ said:
    Terry Pinnell said:
    Paul Saunders said:

    Terry Pinnell wrote:

    > Yes, I can do that, although I normally just rely on the recorded
    > track, which I plot after all walk. But as mentioned, I'm now into
    > geo-tagging, i.e. automatically adding lat/lon to my photos' EXIF
    > data.

    How do you do that automatically? Have you got some software to do it?

    Yes, I discovered a brilliant program last week called gpicsync,
    written by Francois Schnell. See here:
    http://groups.google.com/group/gpicsync

    I installed 0.98 less than a week ago, and this morning ran version
    1.02!

    Im excited by the prospect of installing this when I get back from
    Alnwick in one week but I believe my excitment shall be short lived.
    On my etrex legend it saves times in the tracklog data which is ok for
    1 walk but when I go to alnwick Ill be saving each track as I go along
    and Ive noticed there isn't any time data in the saved tracks on the
    GPS. Can this program be used with the EL on more than one track.

    I'm not really sure I follow you or Sandy on this. Are you referring
    to the issue of the limited amount of trackpoint storage in your GPS
    Unit? My Garmin GPS 12 can save only 1024. So on holidays I download
    the day's walk each night onto my Pocket PC using the program G7toCE,
    save it, and then download those files onto my PC on my return. Those
    files are what I've been using to geo-tag my photos with gpicsync (as
    well as my usual output, like a printed map of each).

    As you'll have seen from the details of gpicsync, its inputs are
    - a GPX file of your track. made from your GPS tracklog
    - a folder of your photos (assuming they are timestamped).

    So I'm not clear how any program, gpicsync or Sandy's recommended
    pixgps, can help if you don't have the GPX files for each walk?

    Or have I misunderstood your query please?

    --
    Terry, West Sussex, UK

  13. Terry Pinnell said:


    I'm not really sure I follow you or Sandy on this. Are you referring
    to the issue of the limited amount of trackpoint storage in your GPS
    Unit? My Garmin GPS 12 can save only 1024. So on holidays I download
    the day's walk each night onto my Pocket PC using the program
    G7toCE, save it, and then download those files onto my PC on my
    return. Those files are what I've been using to geo-tag my photos
    with gpicsync (as well as my usual output, like a printed map of
    each).

    As you'll have seen from the details of gpicsync, its inputs are
    - a GPX file of your track. made from your GPS tracklog
    - a folder of your photos (assuming they are timestamped).

    So I'm not clear how any program, gpicsync or Sandy's recommended
    pixgps, can help if you don't have the GPX files for each walk?

    Or have I misunderstood your query please?

    When you save a track on the GPS it drops the time stamp, or it does
    on my Etrex. If I download this to GPS Utility and convert it to a GPX
    file it doesn't geomark the pictures. If I download the live track
    from the Etrex and convert it to a GPX file it works fine.

    You are obviously downloading the live track to the Pocket PC so when
    you use it the time stamp is there and it works with your pictures.

    Hope this makes sense as I have only just started playing with these
    programs 🙂

    --

    Don`t Worry, Be Happy

    Sandy
    --

    E-Mail:- [email hidden]
    Website:- http://www.ftscotland.co.uk
    Looking for a webhost? Try http://www.1and1.co.uk/?k_id=2966019
    Fishing Wild at http://www.wild-fishing-scotland.co.uk/

  14. Sandy Birrell said:
    Terry Pinnell said:


    I'm not really sure I follow you or Sandy on this. Are you referring
    to the issue of the limited amount of trackpoint storage in your GPS
    Unit? My Garmin GPS 12 can save only 1024. So on holidays I download
    the day's walk each night onto my Pocket PC using the program
    G7toCE, save it, and then download those files onto my PC on my
    return. Those files are what I've been using to geo-tag my photos
    with gpicsync (as well as my usual output, like a printed map of
    each).

    As you'll have seen from the details of gpicsync, its inputs are
    - a GPX file of your track. made from your GPS tracklog
    - a folder of your photos (assuming they are timestamped).

    So I'm not clear how any program, gpicsync or Sandy's recommended
    pixgps, can help if you don't have the GPX files for each walk?

    Or have I misunderstood your query please?

    When you save a track on the GPS it drops the time stamp, or it does
    on my Etrex.

    Thanks, understood. That's not a facility I have on my GPS 12. Does it
    prove useful in practice, despite having no timestamp data?

    So, yes, that reinforces my recommendation to download each 'live'
    track, e.g. to a PPC or similar. Or, on some GPS models - I haven't
    done the research yet - store each track, complete with timestamps, on
    an in-built CF or SD card, for later download

    --
    Terry, West Sussex, UK

  15. Terry Pinnell said:

    Thanks, understood. That's not a facility I have on my GPS 12. Does
    it prove useful in practice, despite having no timestamp data?

    It still gives you a track for loading into Map Source, Anquet etc.,
    it just doesn't give you any times. Start, stop, average speed etc.

    Quoted message said:

    So, yes, that reinforces my recommendation to download each 'live'
    track, e.g. to a PPC or similar. Or, on some GPS models - I haven't
    done the research yet - store each track, complete with timestamps,
    on an in-built CF or SD card, for later download

    That is why I leave the live track running for the time I am away,
    while saving each walk as I do it. The other way is to mark each
    picture as a Waypoint which saves a time stamp. I haven't got round to
    testing that though to see if it geomarks the pictures.

    --

    Don`t Worry, Be Happy

    Sandy
    --

    E-Mail:- [email hidden]
    Website:- http://www.ftscotland.co.uk
    Looking for a webhost? Try http://www.1and1.co.uk/?k_id=2966019
    Fishing Wild at http://www.wild-fishing-scotland.co.uk/

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