Wow, I was not aware of that site. Thanks for sharing it, Stan! O-GPS1 related links from that site: https://www.google.com/search?q=O-GPS1+site%3Awww.gyes.eu
On Sat, Sep 14, 2013 at 6:49 PM, Stan Halpin <s...@stans-photography.info> wrote: > BTW, I mislaid my O-GPS1 manual a couple of months ago and needed to do a web > search to find a copy (since Pentax does not offer a pdf download). One of > the pages that showed up in my searches was: > http://www.gyes.eu/photo/photostart.htm > which may well have been referenced here before. 'Tis a review/discussion of > the unit plus links to some other resources including a discussion of > astrotracer accuracy. FWIW. > > stan > > On Sep 14, 2013, at 2:57 AM, David Mann wrote: > >> On Sep 14, 2013, at 2:13 AM, Darren Addy <pixelsmi...@gmail.com> wrote: >> >>> Elevation of location. (ASIDE: This seems to be where "all GPS units >>> exhibit a weakness" but I'm not sure why that is. According to this >>> PDF, >>> http://www.nasa.gov/centers/johnson/pdf/584738main_Wings-ch5c-pgs360-369.pdf >>> the space shuttle created topographical data sets that can give the >>> elevation for virtually any location. Perhaps it is just not built >>> into the GPS system yet, or there is no method for the GPS to "look it >>> up" and enter it into the calculations.) >> >> FWIW I think Garmin Connect uses that database. There's an "elevation >> correction" option that you can activate. It's not much good when you're >> out and about though as this is only done after you've come back and >> uploaded your route :) >> >> What Matthew said about the difference in accuracy is the same as what I'd >> heard so I've deleted my version of the same explanation. >> >> My Garmin watch uses a barometric altimeter which auto-calibrates whenever >> I'm near a known location (ie somewhere I've programmed into the watch with >> its elevation). If the altimeter goes wonky it will switch to GPS >> elevation, but the manual doesn't say the exact conditions under which this >> happens. Being barometric it is of course susceptible to changes in weather >> conditions but once it's calibrated it's pretty good: good enough to give me >> a fairly accurate gradient reading on the hills. >> >> Cheers, >> Dave >> >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- Nothing is sure but death and Pentaxes. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
