[Steve Cholewiak] sent in his diy GPS data logger. It uses an old DeLorme tripmate – these were serial gps units that ran off of internal batteries. A PIC controller reads the NMEA sentences ...

Fast GPS tags provide highly accurate positional ... 2009). Satellite-Relayed Data Loggers (SRDLs) are tags that record an individual's location, speed, dive depth, and temperature of surrounding ...