XPost: comp.os.linux.misc   
   From: bowman@montana.com   
      
   On Mon, 15 Dec 2025 00:12:46 -0500, c186282 wrote:   
      
   >    OLD GPS ... one-second refresh intervals and dead zones. More modern   
   >    GPS, one-tenth-second is common. Speed is very accurate, position is   
   >    now typically around eight feet (can tell which traffic lane you're   
   >    in) or better, altitude ... more iffy.   
      
   The gpx files from my Amazfit watch are at 1 second intervals, at least   
   for the 'walking' activity. I should check to see if it's bumped up for   
   cycling although 1 second would be adequate for 20 mph speeds.   
      
   Eight feet might be optimistic if it's not a dual band receiver picking up   
   the L5 data. My first GPS, a Garmin II, was from before Clinton removed   
   selective availability in 2000. 100m was typical. In the Arizona desert   
   the section markers are small medallions driven into the ground. Being   
   short on trees there aren't any of the helpful markers. I'd find one and   
   try to extrapolate a course to the next. Good luck with finding a 6"   
   marker in the creosote bush. The smallest distance on the GPS was .1 mile.   
      
   https://www.spirent.com/blogs/selective-availability-a-bad-memory-for-gps-   
   developers-and-users   
      
   I did my first two geocaches with it, with a lot of hunting around. After   
   finding one a woman I worked with came up the trail, heading directly   
   toward the cache, and calling off the feet to target. I decided it was   
   time for an equipment upgrade.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)