Without backround map that doesn't tell much to us, but you may notice some interesting things and remember what you were doing there.
You should be able to do it with your mac like this:
1) export your run as gpx. For example
http://connect.garmin.com/explore?owner=pgagarin
-> ratlum night-O
-> export -> gpx file
save it to your laptop.
then go to
http://www.routegadget.net/gps/gpx2dotmap.php
Select the gpx file. Push "submit" and you have the "dot map" without controls. If you like to have control rings, you need to have split times. Go to AP split page:
http://www.attackpoint.org/racesplits.jsp/race_478...
and copy & paste your splits to the splits text area. Just your splits rows without name or anything.
If you did not start you gps few seconds too early or late rings will be misplaces slightly. You can fix this using time calibration field, type there the amount of seconds needed. For Ratlum 6 secs would do.
Then you may like to adjust colouring, speed 1 is ok for me in most terrains, faster runners shuold use something like 1.1 and even slower runners than me may need to use something like 0.8 to get some green colour there.
And when you see the image you can just save it.