Map references like your patrol grid, or those immersion messages are arranged like the numbers on your phone's buttons. 1-2-3, 4-5-6, 7-8-9 above one another in a 3x3 grid. If you get like BC36, the 6 means a similar subdivision of the 3-button. Historically they used 4 subdivision-levels like BE1234 to give precise coordinated. SH3 only uses 2 levels.
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