There are two main approaches to measuring the performance of location-based software for mobile ad hoc networks: live testing and measurements in an emulation testbed. The former is problematic because of high resource costs and low reproducibility. The latter offers the advantage of reproducible network conditions in the laboratory. In addition, location-based software has to be provided with appropriate location information. We develop virtual devices that mimic the interface and functionality of actual positioning devices, and integrate these into an existing network emulation testbed. The combination of mobile network emulation and positioning device emulation facilitates the evaluation of location-based software in different scenarios. We provide sample measurements using an existing location-based adhoc routing protocol implementation for inter-vehicle communication in a scenario with 50 emulated cars. The results are in good agreement with the available simulations.