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I use GPS at work, both a commercial grade unit and my own consumer grade unit. The accuracy claims to be within one meter but I think it is closer to ten meters, but that is still pretty close. If you cannot find the object you are looking for when it is only 10 meters away, it is not likely to be found at all. When navigating using a topographic map, I find using the UTM scale better than using lat-long. It is more precise and easier to locate on the map. UTM tick marks on the map are only 1 kilometer apart. Lat-long tick marks are much further apart and the divisions between do not easily divide by ten. A UTM tick mark is the one or two large number and two small number markings along the edges of the map. The easiest way to train yourself is to locate yourself on a map, set the GPS to UTMs and look at the reading and compare it to the tick marks on the map. <br /> <br />If you do not mind my saying, if you have a topographic map with you, you ought to be able to find a particular spot along the rail line without GPS just by comparing the map features to the land features. But that is up to you. Good luck.
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