Garmin eTrex Summit Owner's Manual And Reference Manual page 67

Appendicies
Appendices
Appendix H
Can I turn off the Track Log?
FAQ's
No. You can clear the track log, but it is always activated.
Remember that if you clear the track log you are also
clearing the elevtation profi le.
What does the message "NO DGPS POSITION" mean?
eTrex Summit had a differential fi x and lost it.
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