QUOTE (Magus @ Apr 30 2008, 07:15 AM)

Gaurd negates the Spirit power of accident or the effects of glitches. I would not say if the storm rolled in naturally the gaurd power would have no effect.
I'm curious how you're getting this interpretation. 288, SR4, "The Guard power gives the critter the ability to prevent
normal environmental accidents and hazards (both natural and those induced by the Accident power), such as preventing someone from succumbing to heatstroke or saving someone from drowning."
Normal environmental accidents to me at sea would be storms, rolling waves, freak shark attacks, whales upending your boat, etc. Things that would not be affected... pirates, sentient sea monster attacks, running out of gas, etc.
I agree that its a little overpowered that a mage can summon a spirit, and ask it to guard him, which lasts till the spirit goes away. My interpretation to prevent that, is for each use of the guard power which prevented something expends a service. This keeps the uses limited, but still useful when you're expecting a glitch/accident power usages/bad things to happen.