Yes, I have found it to be very accurate when it has a clear view of the sky. It is a Garmin Etrex Vista C. I use it for a range of land, water and air activities and am quite satisfied. Unfortunately they have discontinued it but did replace it with the somewhat pricey Vista Cx It is my 4th garmin as I have upgraded several times.

I ride with a wheel speed sensor and they are almost always identical to the tenth of a mph. Errors are usually explainable by having it in a bad spot or under bridges and dense forest.

The lanyard attaches to the bottom of the unit so it will hang upside down with the antenae pointed down... not so good for best reception even in open water on a boat. It is best to keep in a pocket pointed up.