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. 2013 Nov 8;13(11):15307–15323. doi: 10.3390/s131115307

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 9. — (a) One of the trajectories of the tests with one stake and the cord; (b) Low-cost GPS receiver placed over the tractor cab; (c) Laptop inside the tractor cab.