Logging huge tracklogs - Was [OSM-talk] South Downs Way

[Barnett, Phillip]

Just in case it got lost I've reposted ..


The recent firmware update for Garmin Legend CX to 2.50 added the
facility to log tracks to the MicroSD  datacard. If you enable this, it
creates a fresh tracklog every day and stores each daily log as a GPX
file.
As the Garmin manual says, 'Log track to Data card - Records the current
track log data to the microSD card in addition to the unit's internal
memory. This feature is a tool for use by advanced GPS users with
special applications for the tracklog data. Track logs on the data card
are .gpx GPS position data files, and are not used by your unit.'
The default microSD card is 32Mb, or 64Mb if you're lucky like me (more
than advertised, in other words) 1Gb microSD cards are about 30 quid in
the UK. How many track points can you get into a 1 Gb card at one point
per second?
My rough estimate is about a year and a half.

Phillip


-----Original Message-----
From: talk-bounces at openstreetmap.org
[mailto:talk-bounces at openstreetmap.org] On Behalf Of OJW
Sent: 08 July 2006 12:23
To: talk at openstreetmap.org
Subject: Re: [OSM-talk] South Downs Way

Maybe we could have a "tips for taking your GPS walking" page on the
wiki that addresses things like logging times, battery life (solar power
battery chargers?), etc. 

e.g. I just lent someone a GPS for a one-week cycle ride where they
won't have any laptop - I set the logging time to 13 seconds and just
hoping that's long enough to get their entire journey rather than a
high-res portion of their last day ;-)

I'll put up a javascript calculator to play with various combinations of
time/distance intervals. The spreadsheet version is:

http://almien.co.uk/OSM/Tools/JourneyLength/tracklog_size_calculator.sxc

Regards

OJW

On Friday 07 July 2006 17:00, Steve Chilton wrote:
> SDW ride went well. Unfortunately my GPS receiver couldn't hold data 
> for long enough - 8+ hours a day, so I ended up with just the last 
> sections of the tracks each day.


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