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A method for determining a position of a rotatable arm of a center pivot irrigation system may comprise providing a pivot arm position sensing system including a tower unit positionable at the rotatable arm and a GPS receiver at the tower unit, and receiving, from a user over a communication network

A method for determining a position of a rotatable arm of a center pivot irrigation system may comprise providing a pivot arm position sensing system including a tower unit positionable at the rotatable arm and a GPS receiver at the tower unit, and receiving, from a user over a communication network, a schedule for operating the irrigation system as the rotatable arm rotates. The schedule may include at least two instructions for taking an action by the irrigation system with each instruction including an action and a corresponding location for the action. The method may further include downloading the schedule over a communication network to storage on the position sensing system, determining a location of the tower unit as the tower unit moves about the center of rotation using the GPS receiver, and initiating an action when the location corresponds to the location in one of the instructions.

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1. A system for operating an arm of an irrigation system, the system comprising: a tower unit positionable on the arm of the irrigation system;a Global Positioning Satellite (GPS) receiver at the tower unit, the GPS receiver being configured to determine a location of the tower unit as the tower uni

1. A system for operating an arm of an irrigation system, the system comprising: a tower unit positionable on the arm of the irrigation system;a Global Positioning Satellite (GPS) receiver at the tower unit, the GPS receiver being configured to determine a location of the tower unit as the tower unit moves along a path as the arm moves;a receiver configured to receive, over a wireless communication network, a schedule for operating the irrigation system as the arm moves, the schedule including at least two instructions for taking an action by the irrigation system, each instruction including an action to be taken by the irrigation system and a corresponding location at which the action is to be taken;storage in communication with the receiver and configured to store the schedule of instructions received by the receiver; anda comparator configured to receive information regarding the location from the GPS receiver and compare the location of the tower unit to a location in the instructions of the schedule stored on the storage;wherein the system is configured to interface with controls of the irrigation system to initiate an action by the irrigation system when the location of the tower unit corresponds to a location for taking the action In one of the instructions stored on the storage. 2. The system of claim 1 additionally comprising a remote unit configured to interface with the controls of the irrigation system. 3. The system of claim 2 wherein the tower unit is movable with respect to the remote unit. 4. The system of claim 1 additionally comprising a remote unit configured to interface with the controls of the irrigation system; and wherein the remote unit is configured to cause the irrigation system through the controls to take an action of one of the instructions when the location of the tower unit substantially matches the location in one of the instructions. 5. The system of claim 1 wherein the GPS receiver is integrated into the tower unit. 6. The system of claim 1 wherein the tower unit includes a first transmitter for communicating the information regarding the location determined by the GPS receiver. 7. The system of claim 6 additionally comprising a remote unit including a first receiver configured to receive the information regarding the location transmitted by the first transmitter of the tower unit. 8. The system of claim 7 wherein the remote unit includes a second transmitter configured to transmit the information regarding the location of the tower unit to a location remote from the irrigation system over the wireless communication network. 9. The system of claim 8 wherein the first transmitter comprises a radio transmitter configured to communicate with the second transmitter of the remote unit. 10. The system of claim 9 wherein the second transmitter comprises a cellular telephone and the communication network comprises a cellular telephone network. 11. The system of claim 1 wherein the remote unit includes the storage. 12. The system of claim 1 wherein the remote unit includes the comparator. 13. An irrigation system comprising: an irrigation apparatus comprising an arm movable over a field and controls configured to control operation of the movable arm;a system for operating the irrigation apparatus, the system including: a tower unit for positioning on the movable arm of the irrigation system;a Global Positioning Satellite (GPS) receiver configured to determine a location of the tower unit;a receiver configured to receive, over a wireless communication network, a schedule for operating the irrigation system as the arm moves, the schedule including at least two instructions for taking an action by the irrigation system, each instruction including an action to be taken by the irrigation system and a corresponding location at which the action is to be taken;storage in communication with the receiver and configured to store the schedule of instructions received by the receiver; anda comparator configured to receive information regarding the location from the GPS receiver and compare the location of the tower unit to a location in the instructions of the schedule stored on the storage;wherein the system is configured to interface with controls of the irrigation system to initiate an action by the irrigation system when the location of the tower unit corresponds to a location for the action in one of the instructions stored on the storage. 14. The system of claim 13 further comprising a remote unit configured to interface to the controls of the irrigation system. 15. The system of claim 13 wherein the remote unit is configured to cause the irrigation system through the controls to take an action of one of the instructions when the location of the tower unit substantially matches the location in one of the instructions. 16. The system of claim 13 wherein the tower unit is movable with respect to the remote unit. 17. A method for determining a position of an arm of an irrigation system, comprising: providing an arm position sensing system including a tower unit positionable at the arm of the irrigation system and a Global Positioning Satellite (GPS) receiver at the tower unit;receiving, from a user of the irrigation system over a communication network, a schedule for operating the irrigation system as the arm moves, the schedule including at least two instructions for taking an action by the irrigation system, each instruction including an action to be taken by the irrigation system and a corresponding location at which the action is to be taken,downloading the schedule of instructions over a wireless communication network to storage on the position sensing system;determining a location of the tower unit as the tower unit moves along a path of the tower unit as the arm moves over a field using the GPS receiver at the tower unit; andinitiating an action by the irrigation system by the position sensing system when the location of the tower unit corresponds to the location in one of the instructions stored on the position sensing system. 18. The method of claim 17 wherein the downloading of the schedule of instructions is performed over a cellular telephone communication network. 19. The method of claim 17 additionally comprising interfacing a remote unit of the position sensing system to controls of the irrigation system, and wherein the schedule of instructions are downloaded over the wireless communication network to the remote unit and through the remote unit to the controls of the irrigation system to cause an action by the irrigation system. 20. The method of claim 17 additionally comprising transmitting information regarding the location of the tower unit by the position sensing system over the wireless communication network to a server in a location remote from the irrigation system. 21. The method of claim 20 wherein the server is interfaced to a second network through which data regarding the location is accessible by a user. 22. The method of claim 20 additionally comprising displaying, on a site generated by the server and accessible by a user over a communication network, a depiction of the corresponding position of the arm in a representation of an agricultural field corresponding to the transmitted location. 23. The method of claim 22 wherein the depiction includes a visual indication indicating a position of the arm at which an action is to be taken by the irrigation system. 24. The method of claim 20 additionally comprising storing on the server the schedule including a plurality of the instructions. 25. The method of claim 17 additionally comprising providing a site on a network for monitoring a position of the arm and controlling actions of the irrigation system based upon information regarding a location transmitted to a server over the communication network. 26. The method of claim 25 additionally comprising determining on the server a path of locations corresponding to locations of the tower unit as the arm moves over a field, and visually depicting the path of locations on the site. 27. The method of claim 17 additionally comprising providing a server in a location remote from the irrigation system; downloading a photographic image of a field at which the irrigation system is located, andsuperimposing a depiction of the irrigation system on the photographic image of the field in a position corresponding to a location of the irrigation system in the field.