IMO require SOLAS class ships to carry type approved GPS equipment. Saab TransponderTech can offer a number of IMO-compliant GPS and DGPS solutions, either as stand-alone Navigation Systems or as a additions to existing Saab AIS systems.

The navigation products from Saab are self-monitoring and extremely user friendly. They perform continuous RAIM (Receiver Autonomous Integrity Monitoring) calculations. This allows the Officer Of the Watch (OOW) to set the required navigation accuracy for any stage of the journey. The R4 Navigation System from Saab will give continuous feedback and alarm if the accuracy limit is exceeded.