This section of the ActivityWorkshop is intended to house a variety of information about GPS units and their applications. I guess we're going to have to start calling them GNSS systems soon, especially when Galileo gets online, but in the meantime I think we can safely use "GPS" to refer to all satellite navigation systems.
Prune is a java application from the activity workshop for viewing, editing and converting coordinate data from GPS systems. You can find more details about this free program in the software section.
Firstly there is a section on GPS maps detailing how to load free maps from openstreetmap onto the memory card of a Garmin GPS receiver like the eTrex series. Secondly there's an experiment to compare the measurements from an Etrex Vista with an Etrex Vista HCx to analyse receiver precision under different conditions.
The GPS links page provides a variety of links including free software applications and useful websites for getting the most out of your GPS.
Several of the sections in the activity workshop relate to places in Switzerland. The Swiss places page provides an alphabetical list of Swiss places mentioned in this website and suggests activities based in each area.
There are a variety of hike plots available here, with the KMZ files page offering an index. You can view these KMZ files in for example Google Earth or Google Maps.