The export options should support multiple file types, so that exported data can be opened in various systems (caltopo, watches, etc.). Warn users of the various levels of loss involved with each.
CSV
GPX
KML
GeoJSON (with caltopo-compatible symbology)
GeoJSON (with SimpleStyle, if it turns out to differ from what caltopo uses; investigate)
The export options should support multiple file types, so that exported data can be opened in various systems (caltopo, watches, etc.). Warn users of the various levels of loss involved with each.