Creating a marker with the Maps API doesn't send data to any Google server, other than a request for the marker image if you use a stock marker image. It's all done on the client in JavaScript.
You can provide your own marker image to avoid even that request. Don't take my word for this, though. Verify it yourself. Here is a test page you can use: *http://jsfiddle.net/geary/sygRd/1/* To test, open the page in Chrome, and then open the Developer Tools (F12 on Windows, other key shortcuts on other OSes, or find it in the Chrome menu under Tools). Select the Network tab in the developer tools, and use the Clear icon (slashed circle) at the bottom to clear any previous network trace. Now click around on the map. It creates a marker every time you click. You should see these two requests to Google servers: closedhand_8_8.cur - this is the different cursor you see while the mouse is down marker_sprite.png - this is the default marker. Neither of these requests leaks any information about the location you clicked on. You can examine the request headers to confirm this. And you can get rid of the marker_sprite.png request by using your own marker image. Of course there are all sorts of other requests made to Google servers, for the Maps API JavaScript code, the map tiles, cursors (including the one mentioned above), etc. Those requests do log the IP address of the site visitor, but you already know that. Hope that helps! -Mike p.s. This is an interesting enough question that I would suggest posting it on Stack Overflow so more people will see it. Maps API support has pretty much moved over there; not too many people read this old support group any more. If you post it there, ping me and I'll copy the answer too. On Tue, Mar 26, 2013 at 5:03 PM, Jeff Zeminski <j.zemin...@gmail.com> wrote: > My company is considering using Google Maps API for Business to map health > care info. Does the marker data get sent to Google or is it kept on the > client machine? > > When I say "marker data" I mean coordinates, label info, and icon image. > > -- > You received this message because you are subscribed to the Google Groups > "Google Maps JavaScript API v3" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to google-maps-js-api-v3+unsubscr...@googlegroups.com. > To post to this group, send email to > google-maps-js-api-v3@googlegroups.com. > Visit this group at > http://groups.google.com/group/google-maps-js-api-v3?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-maps-js-api-v3+unsubscr...@googlegroups.com. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. Visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
