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NOD:

simple T-junction:

     2
     |
     |
4----1----3

NOD 2 has three entries, each pointing at node 1.

Node 1 is at offsets 0x0000,0x0000
Node 2 is at offsets 0x0000,0x1000
Node 3 is at offsets 0x1000,0x0000
Node 4 is at offsets 0xF000,0x0000

(Offsets are around 0.09 degrees.)

Link bytes are arbitrary but similar.
Suspected bearing bytes are as they should be.
Link flag 0x40 is set for the links originating at 1.

The base location is junk -- replace with something sensible.
Table A contains an entry each for 1-2, 1-3, 1-4 with zero
routing data and pointers to test.net in that order.

The zero-padded area between nodes and tables area is longer
than 0x40, but perhaps shorter than usual. We could add another
0x40 if this is a problem.

Unknown bytes in header copied from another map.

NET:

Three roads, each length 0x64, each flags 0x44,
placeholders for LBL pointer and TRE/RGN data.

NOD pointers to test.nod.