OT in uk.rec.walking but I know there are several mapping experts there,
and hopefully on-topic in the other groups.
--------------------

Could someone set me straight on a basic point please?

GPX files contain timestamps in UTC time (what I call GMT, being rather
old).

After importing these (or the original proprietary GPS-recorded 'MMO'
files) into my particular mapping program, Memory-Map, the time at any
point on a walk can be read out conveniently by hovering over it with the
mouse cursor. Handy for quickly pin-pointing where I stopped for lunch,
when I got back, etc.

No problem for a UK walk, as at worst it's an hour wrong. But for walks in
faraway locations the arithmetic gets tedious (especially if it involves a
date change).

In Mem-Map there appears to be no way to adjust this to local time.

Is this the case with other map apps please? Or (like the excellent GPS
Utility which I use for editing/conversion) do they have a simple way to
adjust?

--
Terry, East Grinstead, UK

On 02/10/2011 11:57, Terry Pinnell wrote:
> OT in uk.rec.walking but I know there are several mapping experts there,
> and hopefully on-topic in the other groups.
> --------------------
>
> Could someone set me straight on a basic point please?
>
> GPX files contain timestamps in UTC time (what I call GMT, being rather
> old).
>
> After importing these (or the original proprietary GPS-recorded 'MMO'
> files) into my particular mapping program, Memory-Map, the time at any
> point on a walk can be read out conveniently by hovering over it with the
> mouse cursor. Handy for quickly pin-pointing where I stopped for lunch,
> when I got back, etc.
>
> No problem for a UK walk, as at worst it's an hour wrong. But for walks in
> faraway locations the arithmetic gets tedious (especially if it involves a
> date change).
>
> In Mem-Map there appears to be no way to adjust this to local time.
>
> Is this the case with other map apps please? Or (like the excellent GPS
> Utility which I use for editing/conversion) do they have a simple way to
> adjust?
>

Just a long shot - what do you get if you change the time zone on your
pc to match the local time?

On 02/10/2011 11:57, Terry Pinnell wrote:
> Could someone set me straight on a basic point please?
>
> GPX files contain timestamps in UTC time (what I call GMT, being rather
> old).
>
> After importing these (or the original proprietary GPS-recorded 'MMO'
> files) into my particular mapping program, Memory-Map, the time at any
> point on a walk can be read out conveniently by hovering over it with the
> mouse cursor. Handy for quickly pin-pointing where I stopped for lunch,
> when I got back, etc.
>
> No problem for a UK walk, as at worst it's an hour wrong. But for walks in
> faraway locations the arithmetic gets tedious (especially if it involves a
> date change).
>
> In Mem-Map there appears to be no way to adjust this to local time.
>
> Is this the case with other map apps please? Or (like the excellent GPS
> Utility which I use for editing/conversion) do they have a simple way to
> adjust?

You could process the files using GPSBabel, with the "move" filter. This
will shift the timestamps by a number of hours (or days / minutes
/seconds).
Technically the GPX files would be incorrect, as they would still have
the UTC time, just offset a bit. But it should display the correct time
in Memory-Map etc anyway.

Or Garmin Mapsource has the option to set an offset from UTC for the
displayed times. Though you would have to change this manually each time
you view tracks in different time zones.


--
Craig Wallace
http://craig.neogeo.org.uk
http://www.neogeo.org.uk

Craig Wallace <craigw84@fast_NOSPAM_mail.fm> wrote:

>On 02/10/2011 11:57, Terry Pinnell wrote:
>> Could someone set me straight on a basic point please?
>>
>> GPX files contain timestamps in UTC time (what I call GMT, being rather
>> old).
>>
>> After importing these (or the original proprietary GPS-recorded 'MMO'
>> files) into my particular mapping program, Memory-Map, the time at any
>> point on a walk can be read out conveniently by hovering over it with the
>> mouse cursor. Handy for quickly pin-pointing where I stopped for lunch,
>> when I got back, etc.
>>
>> No problem for a UK walk, as at worst it's an hour wrong. But for walks in
>> faraway locations the arithmetic gets tedious (especially if it involves a
>> date change).
>>
>> In Mem-Map there appears to be no way to adjust this to local time.
>>
>> Is this the case with other map apps please? Or (like the excellent GPS
>> Utility which I use for editing/conversion) do they have a simple way to
>> adjust?
>
>You could process the files using GPSBabel, with the "move" filter. This
>will shift the timestamps by a number of hours (or days / minutes
>/seconds).
>Technically the GPX files would be incorrect, as they would still have
>the UTC time, just offset a bit. But it should display the correct time
>in Memory-Map etc anyway.
>
>Or Garmin Mapsource has the option to set an offset from UTC for the
>displayed times. Though you would have to change this manually each time
>you view tracks in different time zones.

Thanks both. I realise I can permanently edit/convert or temporarily
adjust the display of the GPX with various tools. But before I email
Mem-Map support to gripe about their program's inflexibility in that
respect, I'd like to know if other mapping programs *do* have such an
adjustment feature.

--
Terry, East Grinstead, UK

On 03/10/2011 09:43, Terry Pinnell wrote:
> Craig Wallace<craigw84@fast_NOSPAM_mail.fm> wrote:
>
>> On 02/10/2011 11:57, Terry Pinnell wrote:
>>> Could someone set me straight on a basic point please?
>>>
>>> GPX files contain timestamps in UTC time (what I call GMT, being rather
>>> old).
>>>
>>> After importing these (or the original proprietary GPS-recorded 'MMO'
>>> files) into my particular mapping program, Memory-Map, the time at any
>>> point on a walk can be read out conveniently by hovering over it with the
>>> mouse cursor. Handy for quickly pin-pointing where I stopped for lunch,
>>> when I got back, etc.
>>>
>>> No problem for a UK walk, as at worst it's an hour wrong. But for walks in
>>> faraway locations the arithmetic gets tedious (especially if it involves a
>>> date change).
>>>
>>> In Mem-Map there appears to be no way to adjust this to local time.
>>>
>>> Is this the case with other map apps please? Or (like the excellent GPS
>>> Utility which I use for editing/conversion) do they have a simple way to
>>> adjust?
>>
>> You could process the files using GPSBabel, with the "move" filter.

>> Or Garmin Mapsource has the option to set an offset from UTC for the
>> displayed times. Though you would have to change this manually each time
>> you view tracks in different time zones.
>
> Thanks both. I realise I can permanently edit/convert or temporarily
> adjust the display of the GPX with various tools. But before I email
> Mem-Map support to gripe about their program's inflexibility in that
> respect, I'd like to know if other mapping programs *do* have such an
> adjustment feature.
>

It's not available in Oziexplorer. It's a PITA when you are trying to
figure out where you were at a particular time on a walk.

I keep my camera clocks on UTC/GMT to avoid confusion. But if I am
looking at a track in Ozi to figure out where I took a photo whilst the
computer clock is on BST the times Ozi displays from the track are out
by an hour but they are correct internally.
--
Phil Cook

Phil Cook <(E-Mail Removed)> wrote:

>On 03/10/2011 09:43, Terry Pinnell wrote:
>> Craig Wallace<craigw84@fast_NOSPAM_mail.fm> wrote:
>>
>>> On 02/10/2011 11:57, Terry Pinnell wrote:
>>>> Could someone set me straight on a basic point please?
>>>>
>>>> GPX files contain timestamps in UTC time (what I call GMT, being rather
>>>> old).
>>>>
>>>> After importing these (or the original proprietary GPS-recorded 'MMO'
>>>> files) into my particular mapping program, Memory-Map, the time at any
>>>> point on a walk can be read out conveniently by hovering over it with the
>>>> mouse cursor. Handy for quickly pin-pointing where I stopped for lunch,
>>>> when I got back, etc.
>>>>
>>>> No problem for a UK walk, as at worst it's an hour wrong. But for walks in
>>>> faraway locations the arithmetic gets tedious (especially if it involves a
>>>> date change).
>>>>
>>>> In Mem-Map there appears to be no way to adjust this to local time.
>>>>
>>>> Is this the case with other map apps please? Or (like the excellent GPS
>>>> Utility which I use for editing/conversion) do they have a simple way to
>>>> adjust?
>>>
>>> You could process the files using GPSBabel, with the "move" filter.
>
>>> Or Garmin Mapsource has the option to set an offset from UTC for the
>>> displayed times. Though you would have to change this manually each time
>>> you view tracks in different time zones.
>>
>> Thanks both. I realise I can permanently edit/convert or temporarily
>> adjust the display of the GPX with various tools. But before I email
>> Mem-Map support to gripe about their program's inflexibility in that
>> respect, I'd like to know if other mapping programs *do* have such an
>> adjustment feature.
>>
>
>It's not available in Oziexplorer. It's a PITA when you are trying to
>figure out where you were at a particular time on a walk.
>
>I keep my camera clocks on UTC/GMT to avoid confusion. But if I am
>looking at a track in Ozi to figure out where I took a photo whilst the
>computer clock is on BST the times Ozi displays from the track are out
>by an hour but they are correct internally.

Thanks Phil. Not a flaw confined to Mem-Map then. I wonder if Tracklogs
allows adjustment?

As I mentioned, GPS Utility does, but I don't use it for map viewing, only
for editing & conversion (and occasionally creating elevation charts), so
that doesn't help much.
--
Terry, East Grinstead, UK

I use an Vista HCx. Have you gone into your gps time settings and set
it for the time zone you are in. I download my tracks to OziExplorer
and the track files have the proper time stamp for each of the track
points. I think you can fix your problem for future tracks but you have
to do it in your gps.
--
<Bill>

Brought to you from Anchorage, Alaska.

Terry Pinnell wrote:
> OT in uk.rec.walking but I know there are several mapping experts
> there, and hopefully on-topic in the other groups.
> --------------------
>
> Could someone set me straight on a basic point please?
>
> GPX files contain timestamps in UTC time (what I call GMT, being
> rather old).
>
> After importing these (or the original proprietary GPS-recorded 'MMO'
> files) into my particular mapping program, Memory-Map, the time at any
> point on a walk can be read out conveniently by hovering over it with
> the mouse cursor. Handy for quickly pin-pointing where I stopped for
> lunch, when I got back, etc.
>
> No problem for a UK walk, as at worst it's an hour wrong. But for
> walks in faraway locations the arithmetic gets tedious (especially if
> it involves a date change).
>
> In Mem-Map there appears to be no way to adjust this to local time.
>
> Is this the case with other map apps please? Or (like the excellent
> GPS Utility which I use for editing/conversion) do they have a simple
> way to adjust?

On 03/10/2011 19:40, Bill Bradshaw wrote:
> I use an Vista HCx. Have you gone into your gps time settings and set
> it for the time zone you are in. I download my tracks to OziExplorer
> and the track files have the proper time stamp for each of the track
> points. I think you can fix your problem for future tracks but you have
> to do it in your gps.

The GPS records its timestamps in UTC Ozi then converts them for display.

As far as I know if you import a track into Ozi it keeps it in UTC when
you save it as a .plt file. It then displays the time of track points
based on your current PC clock setting.

However, looking at some tracks just now it seems that Ozi has changed.
I have tracks from summer and winter showing the correct local time (GMT
or BST) in the "show track list" window. I know they are all in UTC when
I look at the actual .plt file.

--
Phil Cook

I forgot. There is a problem with using older tracks with the new
versions of OziExplorer because the way the track date is recorded
changed. There is more info in the OziUsers-L group on
groups.yahoo.com.
--
<Bill>

Brought to you from Anchorage, Alaska.

Phil Cook wrote:
> On 03/10/2011 19:40, Bill Bradshaw wrote:
>> I use an Vista HCx. Have you gone into your gps time settings and
>> set it for the time zone you are in. I download my tracks to
>> OziExplorer and the track files have the proper time stamp for each
>> of the track points. I think you can fix your problem for future
>> tracks but you have to do it in your gps.
>
> The GPS records its timestamps in UTC Ozi then converts them for
> display.
> As far as I know if you import a track into Ozi it keeps it in UTC
> when you save it as a .plt file. It then displays the time of track
> points based on your current PC clock setting.
>
> However, looking at some tracks just now it seems that Ozi has
> changed. I have tracks from summer and winter showing the correct
> local time (GMT or BST) in the "show track list" window. I know they
> are all in UTC when I look at the actual .plt file.

Phil Cook wrote:

> It's not available in Oziexplorer. It's a PITA when you are trying to
> figure out where you were at a particular time on a walk.
>
> I keep my camera clocks on UTC/GMT to avoid confusion. But if I am
> looking at a track in Ozi to figure out where I took a photo whilst
> the computer clock is on BST the times Ozi displays from the track
> are out by an hour but they are correct internally.


I use EXiFtool (its controlled in a command-line / script manner) to sort
out the discrepancies, it can write the Long/Lat into the photo EXIF data,
having correctly adjusted for any mis-match between camera time and GPS
time. The result is that, the photo file now "knows" where it was taken.


A second pass then creates a Google KML file which will display the GPS
trace and photographs on Google Earth.


- Nigel



--
Nigel Cliffe,
Webmaster at http://www.2mm.org.uk/