Hei Leo, Unfortunately I do not recall where I read comparison of "proper GPS" and Smartphones regarding precision. But as far as I remember precision difference depends very much on where you are. Smartphones (and also tablets I guess) make also use of the cell towers / access points to the mobile network for positioning. So, if you are working in towns or populated areas you get probably comparable precision to a commercial GPS (a few meters difference). But if you are in remote areas, difference can be more significant 20m and more...
Others please correct me if I am wrong... And as Zoltan writes: what is "good" (or more precise "suitable") depends on your needs... Cheers Stefan
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