The inReach SE and inReach Explorer allow you to delete your message and tracking history. The data is bundled by day. If you only need to delete one specific message you may want to use this article instead: http://support.inreachcanada.com/kb/articles/123
To delete the device history perform the following steps on the inReach SE or inReach Explorer:
1. Select the History icon from the main menu.
2. Select a day.
3. Each data point for that day will be listed.
4. Scroll to the bottom of the list and select Delete.
Note: This will delete all of the tracking and messaging data for that day.
5. A warning will appear, select Delete.