Experience For Starship Combat
PCs should earn experience points (XP) for defeating enemy ships. To award XP, compare the difficulty of the encounter (see Challenge above) to Table 11–1: Encounter Difficulty on page 390 to find the Challenge Rating equivalent of the encounter. Look up the value of that CR on Table 11–3: Experience Point Awards (also on page 390) to find the party’s XP award for the encounter.
For example, suppose the PCs have an Average Party Level (APL) of 10 and are flying a tier 10 starship. They encounter and defeat a tier 9 enemy starship. As the enemy starship’s tier equals the PCs’ starship’s tier – 1, this was a challenging encounter. Looking at Table 11–1: Encounter Difficulty, a challenging encounter has a CR equivalent of APL + 1, making it a CR 11 encounter. The PCs should earn 12,800 XP total for the encounter.
Source
Core Rulebook pg. 326