channel (the high-speed peripheral bus on mainframe computers, analogous to PCI)
Since Garmin takes GPS measurements once per second, this is a convenient way to determine at exactly what time each new point occurred. For the point 60% from A to B, it’s just the GPS timestamp of A plus 0.60 seconds. For the latitude and longitude of the interpolated point, we can just interpolate the latitude and longitude coordinates separately. 3 meters is not even close to far enough for great-circle paths to matter. So e.g.
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