They could be some kind of... some kind of landmark, visual mapping system so they could navigate, coordinate... makes sense.
Ađ ūeir gaetu veriđ eins konar kennileiti synilegt leiđsögukerfi svo ađ geimverurnar geti siglt í skipunum. Samraemt ferđir sínar. Ūađ er vit í ūví.