The introduction of real-time MRI-guided cardiac ablation therapy, a significant advancement in interventional medicine, necessitates precise catheter tracking for accurate navigation within the complex cardiac anatomy. The introduction of the NorthStar software as an active tracking system holds promise for improving the precision and efficiency of catheter manipulation during these procedures. However, a rigorous evaluation of its accuracy and reliability in a clinical setting is crucial to validate its viability. The objective of this study is to evaluate the accuracy of catheter localization using the NorthStar software during real-time MRI-guided cardiac ablation therapy.