During the cruise phase, engineers have five opportunities (plus one backup maneuver and one contingency maneuver) to adjust the flight path. During these trajectory correction maneuvers, engineers will calculate the spacecraft’s location and command eight thrusters on the cruise stage to fire for a specific amount of time needed to tweak the path.

The maneuvers are very important because years of careful planning led to selection of Jezero Crater as the landing site on Mars, and fine-tuning the flight path ensures that the spacecraft will enter the Mars atmosphere at just the right spot to land inside Jezero crater.

The trip to Mars will take about seven months and about 300 million miles (480 million kilometers). During that journey, engineers have several opportunities to adjust the spacecraft’s flight path, to make sure its speed and direction are best for arrival at Jezero Crater on Mars. The first tweak to the spacecraft’s flight path happens about 15 days after launch. https://mars.nasa.gov/mars2020/timeline/cruise/