What I am going to discuss is for the most part just common sense. However, some folks might not have considered it. When you jump in your car to travel with your radar laser detector or global positioning system, where you mount it on the windshield with suction cups is very important for safety and functionality. However, I want to concentrate on safety for the most part.
First, is it legal in your state to mount suction cup devices on your windshield? In both California and Minnesota, it's illegal to have any suction cup device mount to your windshield. OK, you do not live in either of those states. To properly mount your device, there are a couple of keys to having it remain mounted and in position. An accident could happen if the device came loose from the windshield while you are driving. It could distract your attention and result in an accident. To get the cups of your Garmin Nuvi GPS or other brand of global positioning system to remain in place, first make sure that the surface is clean. Most windshields if not cleaned regularly can develop a film on the inside, and this is enough to cause the device to come falling down in a short period of time. Next, you want to slightly moisten the contact surface of the suction cups. This will give you a good bound that will last your entire trip if done properly. I have heard that if you take a very small amount of Vaseline and coat the suction cups, and they will remain in place for a very long time. However, I have not tried it.
Secondly, you want to mount your navigator GPS or radar jammer in a proper location on the windshield. The last thing we want is for the device to obstruct our view while driving. Avoid mounting in proximity to the corner posts of your windshield. The corner posts are the vertical metal posts that are on both ends of your windshield and run from the roof to the lower body of your vehicle. If placed near these corner posts, your radar laser detector or global positioning system can create a blind spot. In most vehicles, there already exists a blind spot there, and we do not want to make it worst. SUVs are very prone to this. Mount your device in a position where it will not interfere with your view and be functional. In the case of a navigator GPS, it needs to "see" the sky in order to receive the signals from the satellites. For a laser radar, it needs to be where it has a clear view of both the front and the back views of the road. An ideal position for a detector is to mount it on the visor. However, the only drawback to this is that you need to "hardwire" the power source up to the visor. Most manufacturers of radar laser detectors have these as accessory kits, and they are relatively easy to do if you are handy with tools and wiring.
Please follow this advice when traveling with your global positioning system or radar laser detector for safety and functionality. You'll be safe on the road and your device will work as it was intended to. Have a great safe trip.