diff --git a/explanations.json b/explanations.json
index 6863ba9..76b7b7c 100644
--- a/explanations.json
+++ b/explanations.json
@@ -4821,14 +4821,14 @@
     "confidence": 9
   },
   "BD107": {
-    "revision": 4,
-    "explanation": "DP0GVN is one of the German exterritorial class A station patterns; DP0 is used for special locations outside ordinary German territory. <u>Hilfsmittel:</u> a table lookup — Rufzeichenplan, Suffixe (S. 5): DP0–DP1 = exterritorial class A.",
+    "revision": 6,
+    "explanation": "DP0GVN has a 3-letter suffix, so use the Hilfsmittel table for 2- or 3-letter suffixes, not the separate 1-letter club-station table. The sentence directly above that table says the DP series is intended for call signs with exterritorial locations; the DP0-DP1 row then gives class A. So this is an exterritorial class A amateur station. The Gaststreitkraefte distractor is wrong because the same Hilfsmittel text says no special call-sign series are provided for them.",
     "source": "https://50ohm.de/NEA_exterritoriale_stationen.html#BD107",
     "confidence": 8
   },
   "BD108": {
-    "revision": 4,
-    "explanation": "DP0POL follows the same exterritorial class A pattern as other German Antarctic or special-location stations. <u>Hilfsmittel:</u> a table lookup — Rufzeichenplan, Suffixe (S. 5): DP0–DP1 = exterritorial class A.",
+    "revision": 6,
+    "explanation": "DP0POL has a 3-letter suffix, so use the Hilfsmittel table for 2- or 3-letter suffixes, not the separate 1-letter club-station table. The sentence directly above that table says the DP series is intended for call signs with exterritorial locations; the DP0-DP1 row then gives class A. So this is an exterritorial class A amateur station. The Gaststreitkraefte distractor is wrong because the same Hilfsmittel text says no special call-sign series are provided for them.",
     "source": "https://50ohm.de/NEA_exterritoriale_stationen.html#BD108",
     "confidence": 8
   },
diff --git a/references/Hilfsmittel.md b/references/Hilfsmittel.md
index d4c4793..1f5f40f 100644
--- a/references/Hilfsmittel.md
+++ b/references/Hilfsmittel.md
@@ -55,7 +55,9 @@ those are memory items.
 - **S. 5 — Tabelle "Rufzeichen mit 2- oder 3-buchstabigen Suffixen":**
   the main **call-sign-series → class/use** table. DA0 = Klubstation;
   DL1–DL9 = person-bound class A; DO1–DO9 = class E; DN9 = class N;
-  DP0–DP1 = exterritorial class A; etc.
+  DP is intended for exterritorial-location call signs; DP0–DP1 =
+  class A with use categories KS, RL/FB and SZ; DP2 = class E with the
+  same use categories; DP8 = class N with the same use categories.
 - **S. 6** — club-station suffixes (1-char) table.
 - **S. 7** — club-station suffixes (4–7-digit); **§ 5** Kurzzeitzulassungen
   ausländischer Funkamateure (visitors in Germany sign **DL/** class A,