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1. Accuracy will vary but generally not to the extent experienced and not for a prolonged period of time
2. The provisor is that there wasn't a major satellite malfunction at the time. There has been no such reports or occurances indicated in recent times.
3. Low horizon satellites would not give the affect experienced, not present day as the constellation is fully populated and effectively running an additional 7 to even 8 sats over spec
4. The biggest possible affect on horz error would be the reverse situation where all satellites were directly overhead but this is a long call as well.
I have a Garmin GPS72 & found it WAAS enabled, ( this feature not available in Oz apparently) Once i turned this feature off the GPS was far more accurate, thought this might help.
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