No it ain't correct. Satellite signals are blocked by conductive materials such as metals, and to a limited extend by materials containing humidity (= limited conductivity) such as leaves and possibly concrete. Due to their high frequency GPS signal tend to behave like light, meaning that when there is metal in the line of sight between GPS and satellite, there is decreased reception quality. Most satellites can be seen (in west Europe and USA) in the southern direction, and an uncovered horizon will give better signals.
Gert Gremmen -----Oorspronkelijk bericht----- Van: talk-boun...@openstreetmap.org [mailto:talk-boun...@openstreetmap.org] Namens Dave F. Verzonden: dinsdag 16 februari 2010 18:46 Aan: John Smith CC: OpenStreetMap talk mailing list Onderwerp: Re: [OSM-talk] fwd: Two thirds of mobile users want driving ANDwalking navigation John Smith wrote: > On 17 February 2010 01:40, John F. Eldredge <j...@jfeldredge.com> wrote: > >> Frequently you can't get a position fix at all, if the building has much metal in its structure. I can't get a position fix from inside my house unless I am near a south-facing window, probably due to a metallic-foil vapor barrier in the attic. >> > > It has little to do with the material it's made of, it's all about how > much mass an object has, the more mass the more it will absorb RF. Is this correct? I assumed the reason I had trouble getting reception on board trains because of what their roofs were screened with. I can't believe they'd put much mass up there. Cheers Dave F. _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
