It is often more efficient to divide large-scale EM simulations into different domains and solve each domain using the appropriate method, rather than trying to solve the entire problem with a single EM simulation method. In this example, a GPS antenna was simulated in Time Domain Solver, while the aircraft in Integral Equation Solver. The two were combined by Hybrid solver, resulting in manageable simulation time and memory consumption. In comparison, the brute force method (one solver for the whole model) would require more than a 20x20 meter boundary box, with billions mesh-cells at 1.575 MHz frequency.