What should David do to reduce the risk of crashing when using a GPS?

Programming the GPS before starting the journey is the safest approach to reduce the risk of crashing. This practice allows the driver to focus entirely on the road and avoid distractions while driving. When the GPS is set up in advance, it enables David to have a clear understanding of the route without needing to interact with the device during the journey, which can divert attention away from driving. This minimizes the chance of making sudden movements or taking eyes off the road to input new information or adjustments.

Utilizing the GPS effectively enhances safety by keeping the driver's focus on driving and adhering to traffic conditions. Other options, such as turning off the sound and relying only on visuals, may still pose a risk as it could lead to distraction in different ways. Keeping the GPS on his lap would be dangerous and impractical, as it can obstruct his control of the vehicle. Seeking directions from passengers might require frequent adjustments and discussions, which could lead to distraction and compromise driving safety.