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

[Barnett, Phillip]

Cool. 
I didn't know how big a point was, so took an educated guess. I wasn't too far out, I guess.

I've checked the tracklog saved to microSD by the latest firmware update, and can confirm that it's the FULL tracklog, with all points present (ie, not simplified as happens when a tracklog is 'saved' in the Garmin world) 
Thus, it is very suitable for our purposes.

The Venture Cx with a 1Gb microSD card looks even better...

Phillip


-----Original Message-----
From: talk-bounces at openstreetmap.org on behalf of Gabriel Ebner
Sent: Mon 7/10/2006 7:24 PM
To: talk at openstreetmap.org
Subject: Re: Logging huge tracklogs - Was  [OSM-talk] South Downs Way
 
On Sun, Jul 09, 2006 at 06:53:32PM +0100, Barnett, Phillip wrote:
> 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.

Each point takes 116 bytes, so on a 950M card there should be room for about
8587475.86 nodes (not counting headers), that makes around 99.39 days of
continous 1 pt/s logging, so if you just log 4 hours a day the card will last
for 596.35 days, that's 1.63 years.

  Gabriel.


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