A method for initiating payment transactions from a payment terminal application on a mobile electronic device may include displaying, on a display screen of the mobile electronic device, a first indicia corresponding to a wireless communication antenna location of the mobile electronic device, receiving, at the wireless communication antenna of the mobile electronic device, a first signal from an antenna located in the payment instrument, the first signal received at a first time, receiving, at the wireless communication antenna of the mobile electronic device, a second signal from the antenna located in the payment instrument, the second signal received at a second time later than the first time, determining a difference in a signal strength between the first and second signals, and displaying, on the display screen of the mobile electronic device, a second indicia based on the determined difference in signal strength.