I have found it very useful to be have a mapping solution that shows my exact position on the road network, out in the field on minor roads. I have used Delorme Street Maps for real-time navigation during chases for nearly 20 years. Since the device knows where I am, then the cognitive time suck of tracking the position on paper maps is greatly reduced. Also, I have seen large position errors from my mobile devices when near strong storms - as much as ten miles. This is because the sky view for them is limited because they are inside the car, and storms block part of the sky. My magnetic mounted roof GPS has avoids that problem, because it has a much broader view. But, Delorme is getting long of tooth. Since Garmin bought the company, they killed off the product as far as I know - no more updates - the latest is 2015. I've been looking for alternatives without much success. I run a Macbook Pro in the car, but can run Windows 10 or Linux as a VM. That's how I have run Delorme the last couple of years. So a solution for Windoze, Linux or Mac OS would work. An alternative solution would be a way to send position from an external GPS to my Android tablet or phone. I know that can be done with Bluetooth through a hack (use the developer mode, and a special app, to read the GPS and give the device a "mock position"). But, that's a hack, and I don't have a Bluetooth GPS, and I have not seen one with a magnetic mount. Any ideas?