GARMIN 310XT COURSES

This may have already been asked but i want to start using the course function on my 310XT but when i try and save a course it shortens my total distance. ie if i run 6 miles when i save it as a course the distance changes to 5.85 ? any tips on how to use this course function   PS is there anywhere on the web that explains how to use all the functions on 310XT in plain English

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