Jens writes – “I have read your blog entries for GPS data loggers. Instead of getting one of those stand-alone data loggers, I would suggest to get a Garmin e-Trex. This is a standard GPS handheld receiver for outdoor use. They sell for about 100$, collect 10000 data points and run 22 hours on AA cells. And because these have a display and more functions they can also be used for outdoor activities. I wouldn’t save those 5$ and get only a data logger with much less functionality. And even better, you can MAKE the data cable yourself. I made one and it is very easy.” – Link.