Filtering GPS tracks

In practice I find that the tracklogs stored by my Garmin GPS receiver are quite noisy. gpsbabel easily filters the data, but having forgotten the relevant rules once, I thought I'd document them here.

Martin Oldfield, 05 Jun 2013

Faking geocaches in Garmin GPX files

Garmin GPS receivers have a special mode to handle geocaches, but it's not been clear to me how the gadget decides which waypoints are geocaches. These brief notes describe something which works for me.

Martin Oldfield, 05 Jun 2013