mdeweerd's picture

BT747 - New code signatures

The code signing key used for BT747 had to be upgraded to SHA-256.

Unfortunately that also revoked the old key and apparently the timestamping was not properly done with the previous signatures.  So the java laucher complains that the certificate is revoked.

All files have been resigned and republished.

You may need to launch:

javaws -viewer

[on windows : "Windows Key + R" to access the execute popup where you can enter this].

Physikator's picture

Wanted: small tracker with display and large memory

I currently use a Holux M241, and the features I like most are

  • AA battery: you can get them anywhere on this world
  • Display showing coordinates or velocity or distance
  • Good cooperation with BT747

However, the memory for 131000 track points (less with newer firmware) is a bit tiny for any holiday of more than a week.

I found the "Locosys GPS Walker" with about 2 GBytes of Memory (and a built-in mp3-player, who needs that?), but that thing has some disadvantages:

mdeweerd's picture

Is your GPRS Tracker safe ?

When you want to know where you've been using GPS, you basically have two options: active tracking and passive tracking.

Passive tracking is what most users of this site are doing: an electronic devices stores the positions internally and these positions are recovered at  a later time.

Active tracking generally implies the transmission of the current position to some kind of server in "real time".  And that is most of the time done using the GSM/GPRS network.

mdeweerd's picture

Tracking dogs - CollierGPS

Collier GPSCollier GPS

When I discovered about 'Kookoo', the tracked cat back in May, I had no idea that I was going to work on a project to track dogs.  And yet, I did.

If you are interested in this amazingly well designed collar, you can find more information in French at and a demonstration of the interface, but here is my story:

Physikator's picture

Great stuff

It is fascinating how someone puts so much effort and time into such a nice piece of software. I'm no programmer myself, but I did work in software testing some time ago, so I will try to help as best as I can.

My picture shows Ping, who likes to show me the way (sitting on a map). Holly (not shown, my Holux M241) later tells me where I actually was. Ping ususally disagrees ...

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