I am a firm supporter of the OLC; L wrote an article for my club
newsletter and gave a presentation at our monthly meeting using a
modification of Reiner's 2005 SSA OLC one.

However, I'm having a dickens of a time uploading my flight traces to
the OLC.
Use a Cambridge GPS Model 20 and L-NAV.
Extract *.cai file from GPS.
Use the protocol suggested by OLC to convert and tag the traces.
Can't get *.igc file accepted by OLC using either SeeYou or OLC Flight
Claim methods.
The OLC helper has been able to get my traces on OLC. But, he and I
would rather spend the time doing more fun things!
And, I'm not alone out here in Ephrata. I watch my soaring buddies
with Cam 20 GPS go through the same frustration. None of us are
computer geeks, but we are far from newbies (my first home "PC" was a
Timex 1000). My buddies are engineers with lots of computer "hands on"
experience.
Anyone having better success and would share their step by step method?
Could send to me by e-mail unless others are having the same problem.