A.M. 12.5 miles total. This morning was the Fast Running Friend test/debug/fix morning. I ran some with the kids and some alone. Benjamin did 6, Jenny 3, Julia 1, Joseph 2, Jacob 1, William 0.5. Once the bugs were fixed (it took 5 miles), the Fast Running Friend produced near perfect readings, just about as good as it gets for a GPS-only distance/pace estimator. During the last 4 miles with Benjamin it reported 3.99 miles for the distance that I believe to be 4 miles from my calibrated pace-based estimates, and the immediate pace (sampled over 0.08-0.15 mile segments) never contradicted my intuition. Then I dropped him off and went for 3 more. It reported 2.99 on my course, and again the reported immediate pace never contradicted my intuitive estimate. I was quite impressed with how it noticed that I slowed down on the uphills and snow-covered parts, and sped up on the downhills.
P.M. Added a time of day sync with the GPS clock, as well as a separate debugging log to the Fast Running Friend, and ran another mile for the final pre-release test. Then made the official release. You can download it from the official Fast Running Friend site (see link on the left in my profile).