Oracle Enterprise Manager formats LAST_CALL_ET as SYSDATE-LAST_CALL_ET/86400 and displays it as "Last Activity Timestamp" in its session browser. This is a much more useful format than just LAST_CALL_ET.
Please enhance Session Browser to add "Last Activity Timestamp". "Last Activity Timestamp" should be calculated same as in Oracle Enterprise Manager, SYSDATE-LAST_CALL_ET/86400 from V$SESSION.
WORKAROUND
none
STATUS
Enhancement request ST11639 has been submitted to Development for consideration in a future release of SQL Navigator for Oracle