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Add link to TSIP docs
The following is a catalog of active components. Designators italicized still need positive identification; bold have been positively identified. Markings listed where known to help in identification. List additional markings when they differ.
'''U1''' - GPS - [https://www.trimble.com/embeddedsystems/copernicus2.aspx Trimble 63530-50] - 12-channel GPS, 2x serial ports, 2.7-3.3VDC, SBAS, flash almanac/ephemeris/location storage. (The -50 variant is probably a custom variant, and exact capabilities are unknown.) This * This chip defaults to TSIP on the 38400 baud port, which is a binary protocol, and has been captured on this PCB.* [http://ftpserver.org.ru/fileecho/51_EMBED/TSIP.PDF TSIP Protocol Documentation]
''U2 - (Marked G4/905)''
'''U21''' - [http://web.archive.org/web/20190202204556/https://www.ti.com/lit/ds/symlink/cc1050.pdf CC1050] (back) - Low Power Transmitter - 300MHz-1000MHz, variable power, FSK
* [https://www.ti.com/lit/er/swrz006a/swrz006a.pdf Errata]
'''U22''' - [http://web.archive.org/web/20200223104004/http://www.ti.com/lit/ds/symlink/tps791.pdf TPS79133DBUR] - 3.3V LDO - for U21