Midweek long run - a day late

I was planning to run my midweek long run yesterday (Wednesday) straight after work (about 4 pm). Well that got stuffed up, work interferred with my plans and didn't finish until 6 pm. At that point I was semi-tired and hadn't eaten properly all day. It wasn't a normal working day for me. So yesterday was an unplanned rest day. So today straight after work at 3.40 pm I was in Fawkner Park, Melbourne, all ready to go, except with my new Forerunner GPS I was waiting for signals to be acquired. It seemed to take forever, well a good 10-15 minutes. I think maybe the fact that it was completely overcast and raining is not a good combination for GPS signals. I am starting to get frustrated not being able to run when I'm ready. There's only so much strectching one can do, though to fill the time I continue to stretch away, maybe that's a good thing. GPS signals acquired, fuel belt on and I was off. I planned to run at least 20 km alongside both banks of the Yarra River. The course took me through Fawkner Park to Anderson Rd and onto the Yarra heading towards Flinders Street. This has to be one of the most scenic runs anywhere and I'm in the heart of Melbourne. At this time the Yarra is a little busy place, heaps of rowers, runners and cyclists. On crossing the Flinders Street bridge I ran alongside the other side of the Yarra River passing Grange Road, at that point 5.8 km registered on the GPS. I wanted 20 km and so a little bit of mental arithmetic had to be done. At Grange Road on crossing the bridge and returning along the banks of the Yarra I estimated about 5 kms to the finish. I therefore calculated that I needed to continue in the same direction before turning around to the 11 point something km and so rounded up to 12 km. At the 12 km mark on my GPS I turned around and headed for home (starting point) tracking back on myself until the Grange Road bridge. I crossed the bridge and ran along the other bank of the Yarra. Overall the distance ran was 20.61 km for a time of 1:48. One of the problems running on the northern banks of the Yarra is that the track at points is directly alongside or under the freeway. This effects the GSP signal and at points the signal is lost. I also lost a signal around the Anderson Street area both heading out and returning. In actual fact I think the distance ran is probably closer to 21.5 km. It was raining for the entire run, not really a problem as it wasn't cold. It did though highlight a little problem as regards my PB Sports energy gel. When its wet and raining the gels are very awkard to open. I couldn't simply rip the end off as there was no grip. In the end I used the next best thing, my teeth. I'm glad I didn't find this out for the fisrt time in a race or important run.