<iframe width="500" height="400" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="http://www.arcgis.com/home/webmap/templates/OnePane/basicviewer/embed.html?webmap=d612fd2120154531a531b52a3bf7f4a8 &gcsextent=-162.15,9.0935,-59.0543,53.3257&displayslider=true&display scalebar=true&displaybasemaps=true"></iframe><br /><small><a href="http://www.arcgis.com/home/webmap/viewer.html?webmap=d612fd2120154531a531b52a3bf7f4a 8&extent=-162.15,9.0935,-59.0543,53.3257" style="color:#0000FF;text-align:left" target="_blank">View Larger Map</a></small>
I encountered this service recently and decided to give it a shot. www.arcgis.com is the address. This map consists of 3 different .kml files layered together. The service supports shapefiles, .gpx, .csv, and online data services.
Edit: well, I thought with iframe code, it'd work, but I guess not entirely. Too bad. I thought the prospects of displaying multiple .gpx files layered at once onto a map were very good. At any rate, the embed code works well on my website, and you can click the link to view the full map.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: ArcGIS Online for data viewing