Guest jeremy Posted January 5, 2001 Share Posted January 5, 2001 tted on a NAD27 chart will be about 0.65 seconds (65 ft) south and 5 seconds (330 ft) west of its true position. In some areas of the world, the local datum may differ from WGS84 by a mile or more. Many GPS receivers can be set to display positions in a local datum rather than WGS84. Most Garmin receivers can display positions in more that 100 different datums. It appears that Garmin receivers store waypoint positions as WGS84 co-ordinates, and convert between the currently selected datum and WGS84 as needed, so that the physical location of a waypoint should not change as you change the current datum on the receiver. Jeremy Quote Link to comment
Guest jeremy Posted January 5, 2001 Share Posted January 5, 2001 Well, I did find an online converter. I'm asking the webmaster for a copy of the source. http://www.ngs.noaa.gov/cgi-bin/nadcon.prl Jeremy Quote Link to comment
Guest DrewClan Posted January 5, 2001 Share Posted January 5, 2001 That's awesome, Jeremy! I am in awe of the amount of work you put into this terrific site. Thank you! Jay in CT Quote Link to comment
Guest klannamann Posted January 7, 2001 Share Posted January 7, 2001 quote:Originally posted by jeremy:Well, I did find an online converter. I'm asking the webmaster for a copy of the source. http://www.ngs.noaa.gov/cgi-bin/nadcon.prl Jeremy Quote Link to comment
Guest klannamann Posted January 7, 2001 Share Posted January 7, 2001 jeremy- check out jeeep.com http://www.jeeep.com/details/coord/ This is used on geocaching.com's website and automatically links the coordinates. Real handy...I use it all the time, because my Magellan 300 only has 2 decimal places of accuracy in Lat/Long minutes, whereas UTM grid is meters N and E. Ken Lannamann Quote Link to comment
+Sputnik 57 Posted February 12, 2005 Share Posted February 12, 2005 Ever wonder how it all started? Quote Link to comment
Kerry. Posted February 12, 2005 Share Posted February 12, 2005 ....It appears that Garmin receivers store waypoint positions as WGS84 coordinates,<BR><HR></BLOCKQUOTE><BR><BR>Jeremy No they don't Quote Link to comment
+slinger91 Posted February 14, 2005 Share Posted February 14, 2005 Which came first....The GPS or the cache? Quote Link to comment
Freeewilly Posted February 18, 2005 Share Posted February 18, 2005 I found this tool that converts DMS <-> MinDec <-> DegDec on any PocketPC Device: From the author: Pocket CoCon (Coordinates Convertor) License: GNU General Public License Platform: Pocket PC (PDA) Most recent version: 1.0.1779.4438 (released 2004-11-14) Pocket Coordinates Convertor (CoCon) allows conversion of WGS84 coordinates between DMS, MinDec and DegDec formats. I wrote it, because my stupid GPS software outputs data in DMS, my stupid mapping software reuires input in DegDec and stupid Geocaching website gives them only in MinDec format... http://software.altaircom.net/software/cocon.aspx Very small and useful Quote Link to comment
OkieRambler Posted February 18, 2005 Share Posted February 18, 2005 ....It appears that Garmin receivers store waypoint positions as WGS84 coordinates,<BR><HR></BLOCKQUOTE><BR><BR>Jeremy No they don't Kerry, According to customer service at Garmin (when asked about the 76CS in particular) they stated that all coordinates internal to the GPSr were stored in WGS84 coordinates, and were changed upon display to whatever system the user selected. I am not sure if this is true or not for their other receivers . . . Quote Link to comment
+sbell111 Posted February 18, 2005 Share Posted February 18, 2005 However that Jeremy guy was, he sure was helpful. Anybody know if he's still around after all these years? Quote Link to comment
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