The base difficulty for a character to find his way around a planet is 10.

Navigation Modifiers

Planetary Situation Difficulty Modifier
No idea which way is north +10
General idea which way is north 0
Familiar with terrain 0
Terrain completely foreign +5
Completely lost +10
Have a compass or similar navigational tools -5
Plotting a simple course 0
Plotting a complex course +6
Plotting a dangerous course +9
Determine exact location +15
* It is possible to stack modifiers where appropriate - at the game master's discretion.

Navigation Aid Skill Bonuses

Navigation Condition Skill Bonus
Have a poorly drawn map +3
Have a sketchy but accurate map +6
Have a well-drawn map +12
Have a misleading or purposely inaccurate map -6 (and don’t know it)
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