Garmin SL60 - Manual (Page 104)

Software Memory Test
This is a checksum test of the code memory region.
The following screen is displayed for the duration
of this test.
Software Test In Progress...
If the checksum passes, the next screen is displayed
for two seconds.
Software Test Passed
Failure to pass the software checksum test indicates
that the software memory is corrupted. The GPS
board will not continue operation when the
following screen is displayed.
Nav SW Failed: Contact II Morrow
If the Nav software checksum test fails, the COM
board will function properly, but the GPS board
will not operate. The display will only show the
active and standby frequencies.
Non-Volatile RAM Tests
The non-volatile RAM validation code does the
following checks every time the unit is powered up.
Any tests which detect a failure reset the failed
values. Generally, the non-volatile RAM test pages
are not displayed, since in most cases the tests pass.
User Database Memory Failure
User waypoint checksums exist for each User
waypoint. If the checksums do not match, the User
waypoint is deleted. If this occurs, any flight plan
which references this user waypoint is also deleted.
In addition, User comment checksums exist for
each
user-defined waypoint comment. The
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Start Up Displays