The optional Yaesu SU-1 barometric module provides both barometric pressure and altitude measuring capability, perfect for recreational use such as hiking or mountain climbing. (Not meant for navigation or personal safety applications). The VX-6R may even be programmed to monitor pressure and temperature or temperature and altitude while it is turned off! This user-installed accessory mounts under the battery compartment.
Use for VX-5R ,VX-6R and VX-7R