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This page contains some of my notes about the Hammerhead GPS protocol.
Based on my observations as well as other people's comments (including the "sphyrna" documentation), I treat the "0xFF" packet as a request to read registers from the device. These registers are potentially addressed from 0x00 to 0xFF (the 5th byte of the packet) and are specific to each "channel" (0x00 to 0x08, the lower 4 bits of the 4th byte of the packet). I will use this terminology on this page.