A system for measuring pressure in the body comprising an implanted device fordetecting internal absolute pressure, an external monitor providing barometric(atmospheric) pressure, an acoustic or radio telemetric system and a globalpositioning system (GPS). The barometric pressure is retrieved from a remotesource such as an Internet weather web site or a database containing real-timebarometric pressure data for various locations in the world by using the GPSdata. The gauge pressure is then derived by subtracting the barometricpressure from the absolute pressure.
