You could use an extra 2.4GHz receiver to plug the sensor station Into, but you are most likely using one for your marine use already.
I have thought about using a Phidget 1070 micro PC board with an WiFI dongle In the boat for receiving the live view telemetry to the hand-held micro PC screen but this entails a tremendous amount of expensive components. Roughly around $600.00USD and the HiTec Is only around $200.00USD. In any event the great thing about the HTS-NavI telemetry Is that a PC with GSM mobile service or a local WiFI connection can feed live-stream video to your website for the world to view live data and live video. You could use the Phidgets 1070 micro PC board to send the sensor data, video and GPS maps directly with GSM to your I-Phone.
Regards,
John