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LogFile starts with a LogStart:

Variable DataType Comment
MicroSeconds UInt32 Arduino internal timestamp
TimeStamp UInt32 GPS timestamp (ticks since 1970...)
ValueCount UInt16 Number of datavalues per entry

Each Entry looks like this:

Variable DataType Comment
MicroSeconds UInt32 Arduino internal timestamp
Speed UInt16 Horizontal speed in mm/s. multiply with 0.0036 to get km/h
SpeedAccuracy UInt16 Speed accuracy in mm/s. multiply with 0.01 to get m/s
Longitude Int32 Scaling is 1e-7
Latitude Int32 Scaling is 1e-7
Altitude Int32 Unsure of scaling
HorizontalAccuracy UInt32 Unsure of scaling
VerticalAccuracy UInt32 Unsure of scaling
FixType UInt8 3 = Full 3D-Fix
Value[0-ValueCount] UInt16 Value 0, scale 0-1024