Index: trunk/data/validator/unnecessary.mapcss
===================================================================
--- trunk/data/validator/unnecessary.mapcss	(revision 15414)
+++ trunk/data/validator/unnecessary.mapcss	(revision 15419)
@@ -166,2 +166,11 @@
   assertMatch: "way name=house building=yes";
 }
+
+/* #2760 */
+*[/^gpx:/] {
+  throwWarning: tr("{0} should not be uploaded", "{0.key}");
+  group: tr("unnecessary tag");
+  fixRemove: "{0.key}";
+  assertMatch: "node gpx:time=2018-01-01T12:00:00Z";
+  assertNoMatch: "node source=gpx:foo";
+}