I’ve been spending some time on the trail with my Garmin Colorado 300 and have been testing it against the Garmin 60CSx. Some folks have asked questions about satellite reception, since the Colorado reportedly uses a proprietary chipset and not the SiRFstar III found in the 60CSx. The image above compares tracklogs from both for the same mountain bike ride. Topography was steep in places, with canopy varying from deciduous trees to some mixed evergreens. Not the most difficult conditions but challenging enough that older receivers would likely have dropped out numerous times.



