Turn off geotagging
When you geotag a tweet, Echofon remembers this setting and will automatically geotag tweets. Simply press the geotag button again to disable geotagging for that tweet. If you disable geotagging twice in a row, it will stay off until you intentionally turn it on again.
You can also turn off all geotagging from your account preferences at http://twitter.com/account/settings