The S-Boat's few navigational tools were laid out in a simple and logical manner. The navigator plotted the course on a tiny table in the rear of the wheelhouse. Several compasses were carried onboard; a central compass was mounted amidships in a binnacle. The captain, navigator and helmsman had smaller compasses mounted in their respective positions. Further experimentation attempted to conceal the boats to enemy radar. These "radar camouflage" experiments were the roots of modern "stealth" technology. Various materials were evaluated for their ability to either absorb or scatter radar refection. A reflection dimming rubberized coating known as "Tarnmatte" was developed and used on U-Boats. Tests to conceal S-boats to enemy radar using measures such as "Tarnmatte" were partially successful at certain wavelengths, but apparently did not develop to operational use. It was adapted from Luftwaffe equipment considered obsolete, and went into limited Kriegsmarine service in late 1943 Radar Direction Finder Ships stores and consumables 44 Diesel 800 at 30 Knots 24-30