Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great tool for marathon training

I know that some folks have had issues with reception of the GPS. I have tried this tool in both Las Vegas and St. George, UT. I found that if you stand in one place and let it initialize (can take up to 3-5 minutes), it will eventually catch a satellite. Unfortunately, I do not live in heavily wooded areas, so I cannot comment on the coverage there.I bought this tool when it was on sale here at Amazon and I still think it was a terrific bargain. I can't believe how fantastic the software is and all the different types of graphs and information you can plot (heartrate, pace, distance, time, etc.) - it's awesome. It's very helpful in my marathon training.I have never run a marathon before and this tool will certainly help me to complete my first one. In all of my research, it's simply the best tool I have found for training.