In principle, the PPU Range of Products from AD Navigation is designed to interface easily to any portable ECDIS system that accepts standard NMEA messages. However, because it is tightly fine-tuned and optimized for the ADX products, our preference is to supply the world leading QASTOR Pilot Software from QPS b.v., our sister company based in the Netherlands. In particular, Qastor’s integrated Advanced Kalman Filter is implemented to provide unsurpassed accuracy in position, heading, rate of turn and velocity results, even under the most difficult circumstances. Since 2000 QPS has produced portable electronic chart and navigation systems specifically for pilots. QASTOR is designed in compliance with IHO, IMO and IEC standards. Working hand-in-hand with pilot groups, the program is designed with ease of use in mind, fully acknowledging that the pilot cannot be distracted with time-consuming operations behind a computer. Some input will be required under certain circumstances, and many options are available for configuring the program according to the pilot’s wishes, but, in general, Qastor requires minimal pilot interaction while conveying all the necessary pertinent information.