I have just retrieved a small gps buy from ebay, called Mini GPS (enf pg03), cost around 20€ …It is a small size and portable GPS receiver with data collecting and calcualating functions. It also provides indication of geograpic coordinates, directions, world time, distance, milage, and velocity information. Its high-sensitive direction indication guide user to go back original departure position or go to the presetted target position. The unit shows clear travelling date in detail, such as, the direction of the target position, distance, satellite time, and velocity information in usage.
This small unit do not provide to record tracking informations … so we start to disassemble it, in the goal to catch NMEA sentence, he work with a Venus638FLP chip.
After putting the prob of scope on the pin number 44, we got a signal. The idea is to collect this data and record it in a file on sdcard or memory.