I've just finished a converter so now all those megabytes of traces in a custom format can be shared. I don't mind about the Public Domain license.

The receiver is a Haicom HI-204S, my first one. It was purchased in 2005 mainly for a few hobby electronics projects, one of them (and eventually the only one) being a logger. That one is rather of old-school fashion: 8051-based, 256KB of EEPROM for the track, 6 V 4 Ah SLA battery for both receiver and logger. Heck, the whole bunch weighs almost 1.5 kg. A packed binary format holds about 15K records. Being a purist, I keep the receiver on the car roof -- or on a PVC frame protruding from the backpack (cheers, Trimble!).

On the PC those tracks are archived in CSV format. A converter to PLT format exists long ago because OziExplorer is my workhorse. For OpenStreetMap I needed another one. Of course PLT->GPX using GPSBabel was not worth it as important bits like HDOP are already lost.

A bit earlier I coded a diff utility that updates my CSVs given differences between an original .plt and a censored .plt. So now I'm additionally able to weed out data that is obviously wrong, outdated, misleading, needlessly static, or considered too private -- and present it as GPX, even with support for separate track segments.

Hopefully there won't be any nasty errors in the resulting format. SAXCount.exe from xerces-3.0.0 doesn't complain but who knows...