Does Garmin publish a metric for comparing the relative sensitivity of their GPS models? Given I'm interested in purchasing a handheld that will work as well as possible indoors or in heavy tree-cover, I'd like to be able to shop for a model based on this criteria. However, I don't see that Garmin publishes such data.
In particular, I'm interested in a comparison of the Dakota 20 and the 62s. Does that obnoxious antenna sported by the 62s enhance it's sensitivity over a unit without one?