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Najm al din al Misri: Kitab as-Zij fi'Ilm al-Falak: (Islamic Astronomy Tables)(1350) Cairo
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Najm al‐Din Abu Abd Allah Muhammad ibn Muhammad ibn Ibrahim al‐Misri was a 1300–1350 Egyptian (Cairo) astronomer mostly known for writing a large astronomical table that had nearly 415,000 entries. The table is considered to be the largest of its kind ever produced by one person during the Middle Ages. He does have the coordinates for the most important East African Cities in his book.

Taken from: David A. King; Worldmaps for finding the direction and distance to Mecca

Mogadishu: Longitude 86 deg 0 min Latitude 4 deg 0 min. Direction towards Mecca 44 deg 28 min NW
Sofala: Longitude 17 deg 0 min latitude 4 deg 0 min Direction towards Mecca 24 deg 0 min NE
Kilwa: Longitude 84 deg 0 min latitude 8 deg 0 min. Direction towards Mecca 39 deg 2 min NW
Barbara: Longitude 54 deg 0 min latitude 8 deg 0 min. Direction towards Mecca 47 deg 51 min NE
Sofala of the Zanj: Longitude 11 deg 0 min latitude 8 deg 0 min. Direction towards Mecca 20 deg 8 min NE