Riding - Dangerous Riding

Riding and Operating are skills you do not need to roll unless there is a stressful or dangerous situation. So riding a horse to the market does not require a check, while engaging in a high speed pursuit on horseback would.
As a reminder, Riding is used when controlling a sentient mount or small vehicle (like a horse and a hang glider) while operating is used when maneuvering large vehicles where the character needs to keep track of multiple information inputs at all time. Note that many of the vehicles using Operating are piloted by a full crew. Yet, only the captain makes skill checks.
To simplify this section of the document, these skills are interchangeable.
The difficulty for Riding and Piloting checks equals to the silhouette of the vehicle, as per the Dangerous Driving action on page 227 of the Genesys Core Rulebook.
Many modifiers are applied to Dangerous Steering checks. First, you add b or b as per the mount's handling’s score. Then, you add terrain modifiers as per the sidebar on page 227 of the Genesys Core Rulebook. Finally, the Dangerous Driving action description says that the current speed of the vehicle should affect the check. The Table III.2—14: Vehicle Speeds in Structured Encounters on page 221 of the Genesys Core Rulebook gives specific modifiers as per the vehicle's speed. Even though the table refers to structured encounters, it seems right to apply part of it to narrative encounter as well. Of course, we tend to not track the exact speed of the vehicle in narrative situations but it still gives an idea of what modifier to apply should the vehicle be going at full speed.
EXAMPLE OF A DANGEROUS DRIVING CHECK
Lylah is a marine scavenger. She roams the shores of Alwaus looking for places where battles took place and foraging pieces of gear and ship parts — a highly illegal activity according to imperial laws, as these are still owned by their respective factions. Now she just arrived at one such site. She has to make this a quick run as it is only a matter of time before their rightful owner, or any other pirates, claims the booty.
Scanning the area with her telescope, Lylah locates a high tech arcane generator, which is worth enough for her to upgrade her current ship. Problem is, it is located in a cluster of fast-moving debris. The GM calls for a Dangerous Driving check since the maneuver is dangerous.
Lylah's ship has a silhouette of 3 and therefore, the difficulty is set to Hard (ddd). Her nimble ship has a Handling of +2, adding bb to the pool. Since Lylah dropped her speed to 1, she avoids upgrading the check. The GM considers the debris to be the same as a rocky coast, adding b to the pool.
The check comes up generating ssht. Since she succeeded on the check, she manages to get to the reactor. The GM spends the h to have her ship suffer 1 system strain as the constant thrusts and sudden reverse thrusts on her silverline sails to avoid obstacles put stress on the ship's turbine. Lylah spends the t to have her notice a broken yet still intact 9mm Heavy Cannon nearby that she could not see prior to entering the debris field. She might sell that one for at a great profit as well or repair it and then mount it on her own ship.
Once her scavenging is done, she moves away from the debris field and sets her course for the relative safety of open water.