- Even when the fortification card states that there is a one cast open gun position for 76/50-gun in the area, it cannot be found. The explanation for this is, that the fortification card is for the gun position 41, b. That one has been cast and can be found relatively easily, although not from the place where structure 41 has been marked in the map.

- The area to where this gun position 41 has been marked in the map contains only dugout remains which can be viewed in the gallery for the structure 427.

- Structure 41, a & 41, b do not have a separate fortification cards and are not included in any of the fortification cards. Also normally gun positions where different guns have been given a sub-letters, are situated much closer to each other's. Here in the Grundsund area the distance between the structure 41, a and 41, b is over one kilometer. Normally the distance is only tens of meters.