If you expand the photo, you can see the additional gear that I've added to my manpack, in the form of the SCS 3070 Tracker mpunted on the side of the 897. Also required and included is the Byonics GPS2 receiver magnetically mounted on the case of the 897, and connected to the SCS Tracker. Click on the photo for a closer look..... Here is the dope on the HF APRS setup as seen..... http://www.jerryclement.ca/HamRadio/VE6AB-Portable-OPS/i-gfFPbvs