Detect Magic
Source GM Core pg. 41
This activity doesn't enable characters to automatically find every single magical aura or object during travel. Hazards that require a minimum proficiency can't be found with detect magic, nor can illusions of equal or higher rank than the spell.
When characters find something magical using this activity, let them know and give them the option to stop and explore further or continue on. Stopping brings you into a more roleplay-heavy scene in which players can search through an area, assess different items, or otherwise try to figure out the source of the magic and what it does. Continuing on might cause the group to miss out on beneficial magic items or trigger a magic trap.
When characters find something magical using this activity, let them know and give them the option to stop and explore further or continue on. Stopping brings you into a more roleplay-heavy scene in which players can search through an area, assess different items, or otherwise try to figure out the source of the magic and what it does. Continuing on might cause the group to miss out on beneficial magic items or trigger a magic trap.