I did some searching and found this on the Garmin FAQ page:
Question: What is a trip log and how does it work on a nuvi or zumo device?
Answer:
Trip logs are points automatically stored when the GPS device is locked onto a satellite signal and moving. It is the electronic equivalent of laying down a "breadcrumb trail" to mark the path that has been traveled.
Your nuvi or zumo can store 10,000 points before it begins the process of archiving additional logs.* Beyond 10,000 points the device moves the oldest trip data into an internal archive file. Up to 20 archive files can be stored internally on the unit. This means, depending on space available, that the device can store over 200,000 points of trip data.
Note: Archived trip log information is not visible on the device itself, but can be used and seen with Garmin's MapSource product. You can open individual archives to view in MapSource by following the steps below:
1.Open the Garmin device drive located in My Computer. [Note: If using a Mac, the Garmin drive will be located on the Desktop.]
2.Open the Garmin folder.
3.Open the GPX folder.
4.Open the Archive folder.
Each archived GPX file can be opened in the MapSource program.
Note: While some Garmin devices such as the zumo come with the necessary mapping software to install MapSource, it will be necessary to purchase a Garmin mapping product in order to view an archived log from your device on your computer.
*The Archive file feature can be found on the following devices:
- nuvi 500 series
- nuvi 705 series
- nuvi 800 series
- nuvi 805 series
- nuvi 12/13/14/1600 series
- nuvi 3700 series
- zumo 200/400/500/600 series
Anyone (using their GPS extensively) who can confirm that they see 1.gpx, 2.gpx, 3.gpx ..... (up to 20.gpx, depending on how many archived files) in the archive folder.
EDIT: I believe the latest firmware save the auto-archive as [timestamp].gpx
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