Yay - Travellers' Digest #10 and #18 arrived, along with The Early Adventures, which has the important bits from issues #1-4.
Travellers' Digest #18 gives us Ealiyasiyw, which bridges the gap between Reaver's Deep and Riftspan Reaches. If you squint, you can almost see the fastest route to run away from the rats and (most importantly) the cats back to Mora.
Corridor is somewhat filled in by both #18 and #3. #18 gives the full sector, but its circa Year 1119, and the Vargr incursions have swept through most of the spinward parts of the sector. This cuts off the Domain of Deneb - by severing the xboat routes! Since my map is nominally CT (Year 1112) this sucks. However, #3 gives us a Year 1101 map of subsector E, which at least lets us fill in the edge against Deneb.
Issue #10 gives us the subsector names for Core as well as subsectors M (Cadion) and K (Chant), so those have routes now. Don't look too closely at the worlds, though. As Robert Eaglestone points out the data I have isn't great - it's the M0 data from T4 which doesn't match DGP's data - which only covered a few subsectors anyway. We're trying to reconcile the data.
Up next: The Empty Quarter, c/o Jason "Flynn" Kemp and Stellar Reaches. And possibly parts of The Old Expanses from High Passage.