Find-me Posted April 2, 2007 Share Posted April 2, 2007 In every other respect, my Explorist 500 seems to work as it should. The only thing I find really annoying is that the clock is off by around 2.5 minutes (slow). I can set the clock using "preferences-clock" but it doesn't "take". If I reset the unit and enter the correct local time, it "takes" but reverts to the incorrect time as soon as it gets a satellite fix. It doesn't seem to matter whether I use Local or UTC. (I have checked the time compared to the NIST clock) I am currently using the recent (Europe) 2.57 upgrade. I honestly can't say whether this problem existed before the software upgrade. Any ideas? Find-me Quote Link to comment
robertlipe Posted April 2, 2007 Share Posted April 2, 2007 Known problem inherited through this code since the Map330 around the turn of the century. A clear memory will bring it back to reality - for a little while. Quote Link to comment
SandyGarrity Posted April 2, 2007 Share Posted April 2, 2007 I wonder how you can get an accurate fix if the clock is wrong? Quote Link to comment
+Stunod Posted April 2, 2007 Share Posted April 2, 2007 (edited) I wonder how you can get an accurate fix if the clock is wrong? The time really means nothing to the receiver...it is the timing difference between signals that a receiver uses to calculate position. Edited April 2, 2007 by Stunod Quote Link to comment
SandyGarrity Posted April 3, 2007 Share Posted April 3, 2007 Thanks for that Stunod - totally blown my understanding on how GPS system works! Back to my books. Quote Link to comment
robertlipe Posted April 3, 2007 Share Posted April 3, 2007 Well, yes and no. Insanely precise timing is very much a key of how GPS works. The time *displayed to the user* in the Magellans is apparently not actually hooked up to that time source. So it has access to some of the most accurate timekeeping devices ever built; it just chooses to not actually use that data for the time display. It's been this was in Magellans for a very long time. It's baffling that they can't/won't fix this. Quote Link to comment
+EScout Posted April 4, 2007 Share Posted April 4, 2007 GPS time is only 14 seconds ahead of UTC. I would even go for this precision with no correction. Since my firmware upgrade recently, my eX500 is about 3 seconds behind UTC. Before this it was about 2 minutes behind. Quote Link to comment
+EScout Posted April 4, 2007 Share Posted April 4, 2007 (edited) Duplicate post deleted. Edited April 4, 2007 by EScout Quote Link to comment
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