the invention described provides a system and method for executing financial transactions using existing and available technology in a novel manner . the preferred technique allows an individual to use a gps - enabled mobile communication device , such as a cell phone , as a payment device to automate a business transaction . fig1 is a block diagram illustrating a payment device 10 according to the present invention . as shown in fig1 , the payment device can be a mobile communication device 10 that includes a gps receiver 12 , communication interface 14 , processing unit 16 , memory 18 , input / output interface 20 , and a power source 22 , such as a battery . the communication interface 14 preferably includes a particular structure and functionality based upon the type of the device 10 . for example , when the device 10 is a cellular telephone , the communication interface 14 supports a corresponding interface standard e . g ., global system for mobile communication ( gsm ), general packet radio service ( gprs ), enhanced data rates for global evolution ( edge ), universal mobile telecommunications service ( umts ), etc . the communication interface 14 of the device 10 may also / alternately support wireless wide area network ( wwan ), wireless local area network ( wlan ), and / or wire - less personal area network ( wpan ) functionality . when the device 10 is a wlan device for example , the wireless interface 14 preferably supports a standardized communication according to the ieee 802 . 11x group of standards , for example . when the device 10 is a wpan device , the wireless interface 14 preferably supports the bluetooth interface standard or another wpan standard such as the 802 . 15 standard . in any case , the wireless interface 14 can support all or a subset of cellular telephone , wlan , and wpan operations . the processing unit 16 of the device 10 may include any type of processor such as a microprocessor , a digital signal processor , an application specific integrated circuit ( asic ), or a combination of processing type devices . the processing unit 16 is operable to execute a plurality of software instructions that are stored in the memory 18 and are accessed for execution . the processing unit 806 may also include specialized hardware required to implement particular aspects of the present invention . memory 18 may include sram , dram , prom , flash ram , or any other type of memory capable of storing data and instructions . the input / output interface 20 may include a keypad , a mouse , a screen , a touch screen , and / or any other type of interface that allows a user of the device 10 to interact with the device 10 . the power source 22 , such as a battery , operates to power the components of the device 10 . the gps receiver 12 operates to receive gps signals from a plurality of satellites that operate as part of a gps system . in one preferred embodiment , the gps receiver 12 determines a geographic location for the device 10 by calculating a distance between the device 10 and at least three satellites . preferably , the receiver 12 calculates the distance using low - power radio signals received from the satellites using a technique known as trilateration , which is known in the art . the memory 18 of the device is configured to include a gps module 18 a that provides a graphical user interface on the device 10 to identify payment locations , one or more data storage areas 18 b for storing location coordinates identified by the user , and a payment module 18 c capable of initiating a financial transaction instruction to a payment terminal based on a geographic location of the device 10 . details of the gps module 18 a and payment module 18 c are discussed in connection with fig3 - 4 . referring now to fig2 , a financial transaction system for conducting a financial transaction using a mobile communication payment device is disclosed . the system can be used to automate financial transactions based on a geographic location of the payment device 10 . as shown in fig2 , the system includes the payment device 10 disclosed in connection with fig1 , a payment terminal 28 that can operate as a point of sale ( pos ) terminal for merchants , and a network 26 for operatively connecting the payment device 10 to the payment terminal 28 . although only one payment device 10 is shown in fig2 , the present invention is not limited to one payment device and can include a multitude of varied payment devices that are capable of communicating using a wireless protocol . the payment terminal 28 is preferably a computer device that operates as a point of sale terminal for goods or services rendered . in one preferred embodiment , the payment terminal 28 includes a management module 28 a that processes financial transaction instructions received from the device 10 and provides an acknowledgement message to the payment device 10 upon completion of a transaction . as shown in fig2 , the payment terminal 28 is preferably in communication with a financial institution 30 , such as a bank , which has access to a conventional payment network for transaction authorizations . in one preferred embodiment , as shown in fig2 , the system includes a map server 24 that provides maps to the payment device 10 on demand . as used herein , the term ‘ map ’ refers to a representation of the whole or a part of a geographic area . use of the map server 24 is discussed in connection with fig3 and 4 of the disclosure . the network 26 is preferably a wireless network that can be an 802 . 11 - compliant network , bluetooth network , cellular digital packet data ( cdpd ) network , high speed circuit switched data ( hscsd ) network , packet data cellular ( pdc - p ) network , general packet radio service ( gprs ) network , 1x radio transmission technology ( 1xrtt ) network , irda network , multichannel multipoint distribution service ( mmds ) network , local multipoint distribution service ( lmds ) network , worldwide interoperability for microwave access ( wimax ) network , and / or any other network that communicates using a wireless protocol . referring now to fig3 , an example graphical user interface ( gui ) 32 provided by the gps module 18 a is shown . in one preferred embodiment , the gps module 18 a displays the user interface 32 on the screen 20 of the payment device 10 and prompts the user to enter either an address or map name that identifies a particular geographic area to be displayed on the device 10 . in another preferred embodiment , the gps module 18 a displays the graphical user interface 32 on a personal computer ( pc ) attached to the device 10 and prompts the user to enter either an address or map name to be displayed on the device 10 . as shown in the fig3 example , the graphical user interface 32 of the present invention includes a map area 34 , a map - name / address area 42 with map - name / address entry area 44 , an access - map button 46 , a charge - amount entry area 52 , and a select - payment - location button 48 . the map - name / address area 42 provides a listing of previously accessed maps and entered addresses that are user selectable and available for display on the device 10 . in the event a particular map name or address is not included in the area 42 , map - name / address entry area 44 provides a data entry area for entering the particular address or map name which , upon selection of access - map button 46 , is displayed on the device 10 . in one preferred embodiment , the gps module 18 a requests the associated map from the map server 24 which is then displayed in map area 34 . in another preferred embodiment , the gps module 18 a accesses the associated map from memory 18 of the device 10 and displays the same in the map area 34 . as shown in fig3 , in one preferred embodiment , the map displayed can include latitudinal 38 and longitudinal 36 coordinates representing varying degrees of specificity concerning geographic locations and coordinates . once a map is displayed in the map area 34 and the user selects select - payment - location button 48 , the user can then select transaction locations for automatic payment . for example , in one preferred embodiment , upon selection of select - payment - location button 48 , the gps module 18 a displays a cursor that overlays the displayed map and allows the user to identify a particular location 58 on the map where a payment is to be automatically commenced . once a transaction location 58 is identified on the map , the gps module 18 a activates the transaction amount data entry area 52 that allows the user to specify a monetary amount for the transaction . once a value is entered into data entry area 52 and the user selects the save button 54 , the gps module 18 a saves the identified transaction location and entered transaction amount to the data storage area 18 b . for example , in one preferred embodiment , the gps module 18 a calculates transaction coordinates using one or more particular transaction locations 58 identified on the map and stores the calculated transaction coordinates along with the entered transaction amount to the data storage area 18 b . upon the user selecting the exit button 64 , the gps module 30 terminates display of the gui 32 . turning now to fig4 , a typical financial transaction executed by the system using the techniques of the present invention will now be described . as shown in the fig4 example , first , the gps module 18 a of the payment device 10 calculates the current geographical coordinates of the device 10 upon receiving a plurality of satellite signals 60 . as mentioned previously , in one preferred embodiment , the gps module 18 a uses a trilateration technique to determine geographic coordinates of the device 10 . next , the gps module 18 a compares the calculated geographic coordinates to predefined transaction locations stored in the data storage areas 18 of the device 10 . in one preferred embodiment , if the calculated coordinates are within a particular distance of one of the predefined transaction locations 64 , the gps module 18 a activates the payment module 18 c to initiate a financial transaction 66 over the network 26 . if the calculated coordinates are not within a particular distance of any of the stored transaction locations 64 , the gps module 18 a continues to calculate the device &# 39 ; s current geographical location and continues its comparisons . once the payment module 18 c is activated , the payment module 18 c initiates a network connection 68 to the payment terminal 28 . in one preferred embodiment , where the payment device 10 is a cellular phone , a telephone company ( telco ) provider can be used as a gateway into one or more payment networks . for example , an arrangement can be made between the user of the device 10 and the telco provider such that the telco provider would charge a fee for supporting location dependent transactions . in one preferred embodiment , the payment module 18 c initiates the network connection by polling for a wireless network connection as is known in the art . preferably , the network connection is a secure connection that includes encryption and digital authentication . upon the payment terminal 28 verifying the authenticity of the payment device 10 , the payment terminal 28 grants network access to the payment device 10 . once the payment device 10 is connected to the network 26 , the payment module 18 c can send financial transaction instructions to the payment terminal to charge a particular account a predefined transaction amount automatically 70 . next , upon transmission of a financial transaction instruction from the payment device 10 to the payment terminal 28 , the management module 28 a of the payment terminal 28 transmits an authorization request to the financial institution 30 for approval 72 . in one preferred embodiment , the financial institution 30 in turn forwards the authorization request through a conventional payment network to a credit grantor . based upon the payment device user &# 39 ; s account status and the amount of transaction , the credit grantor can authorize or deny the authorization request 74 . the grantor &# 39 ; s response is then routed back through the financial institution 30 to the payment terminal 28 and payment device 10 . a number of embodiments of the invention have been described . nevertheless , it will be understood that various modifications may be made without departing from the spirit and scope of the invention . for example , payment terminals can provide messages to payment devices that could include information relating to upcoming offers and sales . also , the steps described above may be modified in various ways or performed in a different order than described above , where appropriate . accordingly , alternative embodiments are within the scope of the following claims .