I wouldn't rely on electronics to get you through the Ledges; the GPS signal bounces all over the place in there, and you could easily be 50m off at any given moment. Photos and videos will be much better guidance.
Thanks for the heads up. I'll lurk this forum again once climbing season begins to see what pictures people have taken during that time...and maybe pester a few people here and there for images of the most important turns. I plan on using electronics for just general navigational purposes from the lakes so we don't go off too much off route.