Garmin Forerunner 305 GPS Receiver With Heart Rate Monitor

The Garmin Forerunner 305 GPS Receiver With Heart Rate Monitor has 616 reviews all with 5 out of 5 stars from AMAZON.COM. Here is one from:

P.Lange,
I have had the 305 for about 6 weeks and am very pleased with it. It is my first GPS watch and has exceeded my expectations. I had read the concerns with the altimeter and agree, it does not provide useful or accurate information so no surprises there. The real issue for me was how well it would measure distance. I have found it to be very accurate and reliable. I have several runs that I have clocked with the car and measuring tools on Google Earth; the Garmin hit my mile split expectations anywhere from spot on to 20-30 feet from what I believed the true splits to be. At the end of the 10 mile run I was also within 20 feet of expectation. So maybe one mile measures a few feet long, another a few feet short, but cumulatively it was right on my prior expectations.