This site uses different types of cookies, including analytics and functional cookies (its own and from other sites). To change your cookie settings or find out more, click here. If you continue browsing our website, you accept these cookies.
Since you're only looking a 15 sec of GPS data, you should be able to use the Area (Sq Miles or Sq Kilometers) in the Spatial Info tool, which will give the area of the polygon returned from the Poly-Build tool. Straight lines will have an area "close" to 0. Curves will have a larger area.
Now you just have to define how "close" to 0 the area of a line has to be to be considered straight