2. GPS Track Cleansing

   I carried my GPS logger around and took some GPS logs. Now it's time to view them.

   As my logger records everything sent from GPS receiving module without filtering, logs have some apparent outliers as shown in the image (A) below. Watch slant lines. In fact, outliers are at coordinate …

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3. Case and Conclusion of my GPS Logger - for Now

   As I wrote at the beginning, I started my own GPS logger development for the following motivations. I put marks for my currently developed GPS logger.

   Motivation	Mark	Comment
   Easier log extraction	✓	GPS log is now a regular file!
   QZSS support	✗	Only 1 of 4 satellites supported.
   Much larger log …

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4. What Material Interferes GPS Signal?

   As I wrote in the previous post, I concluded that flat structure is preferred based on the experiment.

   The next question I had was "can I keep my GPS logger in something?". Even though I know completely uncovered is clearly the best way to operate GPS logger, I would rather …

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