--- a/pkg/imports/wp.go	Mon Feb 11 15:57:20 2019 +0100
+++ b/pkg/imports/wp.go	Mon Feb 11 16:16:35 2019 +0100
@@ -96,6 +96,11 @@
 INSERT INTO wp_geoms (geom) VALUES (
   ST_Transform(ST_GeomFromWKB($1, $2::int), 4326)
 )`
+	hasDistanceMarkSQL = `
+SELECT true FROM waterway.distance_marks_virtual
+WHERE location_code =
+  ($1::char(2), $2::char(3), $3::char(5), $4::char(5), $5::int)
+LIMIT 1`
 
 	insertWaterwayProfileSQL = `
 INSERT INTO waterway.waterway_profiles (
@@ -430,6 +435,12 @@
 	}
 	defer trackStmt.Close()
 
+	hasDistanceMarkStmt, err := tx.PrepareContext(ctx, hasDistanceMarkSQL)
+	if err != nil {
+		return nil, err
+	}
+	defer hasDistanceMarkStmt.Close()
+
 	var ids []int64
 
 lines:
@@ -450,6 +461,26 @@
 				line, err)
 		}
 
+		var dummy bool
+		err = hasDistanceMarkStmt.QueryRowContext(
+			ctx,
+			location.CountryCode,
+			location.LoCode,
+			location.FairwaySection,
+			location.Orc,
+			location.Hectometre,
+		).Scan(&dummy)
+
+		switch {
+		case err == sql.ErrNoRows:
+			feedback.Warn("No virtual distance mark found for %s.", location)
+			continue lines
+		case err != nil:
+			return nil, err
+		case !dummy:
+			return nil, errors.New("unexpected result form database")
+		}
+
 		validFromTime, err := parseDate(row[validFromIdx])
 		if err != nil {
 			return nil, fmt.Errorf(