Quote:
Originally Posted by Vaevictis Asmadi
Why is is there no default from land Navigation to Astronomy? In low-tech, Astronomy is useful for Sea and Air Navigation, so why not for land?
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Often, you can't see the sky when using land navigation, especially if you're in built-up areas, woods, or mountains. OTOH, in terrain where you can see the sky clearly celestial navigation is entirely possible using land nav, so Astronomy/TL should give a default.
Quote:
Originally Posted by Vaevictis Asmadi
Also, on a flat world with no curvature nor horizon, would any of the defaults between specialties and other skills change? In particular, how would that affect defaults from Navigation to Astronomy?
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I'd give an unfamiliarity penalty when navigating on an oddly shaped world, as compared to the sort of world you're used to. Those penalties would carry over to attempts to use skill defaults. For really weird situations, just create a new specialization of Navigation, like Navigation (Discworld) or Navigation (Astral) and let it default to the most similar RAW Navigation specialty at -4.