With multi-frequency GNSS services more and more moving to the center of attention in safety critical applications of navigation and timing, interference – whether intentional or not – poses as a problem to be addressed. Especially in the case where the user needs high accuracy in addition to high reliability, the tolerable amount of interference shrinks to a minimum. With the dawn Galileo’s High Accuracy Service, a freely available PPP service broadcast by the MEO constellation itself, we focus on the use case of autonomous driving in this study. We derived a method to display potential implications of interference on the E6B signal reception on German highways based on the characteristics of the interference signal & transmitter, user receiver and distance between them. Considering this, the delta in C/N0 (signal-to-noise ratio) is computed and may be understood as a “worst case” impediment. The topography is neglected in this study. With the procedure established, we parametrize three different receiver categories representative for various market sectors as well as two types signals, which are reckoned among the most popular within the amateur radio community on the E6 band. The final product of the study comprises a heatmap for each scenario, identifying the impact of a certain transmitter location on the closest user receiver. We show that, for specific receiver-signal combinations, coexistence is possible regarding the (1dB-IPC) 1dB interference protection criterion [1] to a large extent, yet there are still areas affected by severe interference.