For the next device Janus may look at a weather ward against heavy weather. He already knows spells like this for Similar Spell bonus to lab total.
However this can be a tricky idea, because warding a ship against weather may defy the purpose óf sailing. Of course, one could simply magically create the wind needed to sail with, and if the ward only covers mundane weather effects then Robert is your father's brother.
Right now I can't understand why I had Janus invent a weather ward spell ReAu of Base 20 when the guidelines don't go above base 10 for "very severe".
Warding the ship I think I'll do with T:Ind with sufficient size modifiers - but how many? For a ward the target is the object or person protected, so it makes no sense to look at the definitions for Auram Individual...?
Using T:Structure seems silly since it shouldn't cover the mast, sail and rigging since Structure to me sounds like the entire hull and superstructure...unless the mast etc. is merely viewed as 'outside stuff on a building' like spire on a tower may???
My other ideas include:
*Cr(Re)Au to create and control wind, allowing change of force and direction. Base 2 sounds like enough since I don't want the 'gale force wind' for base 3 (or do I? is a gale good for sailing?) and add magnitudes for the ability to control direction and force, +2 mags total I think. Plus R:Sight for another +3 and D:Conc for +1 and +5 levels for Device keeps concentration, +uses per day...Probably no more than level 30 then.
*Ward against water, something like Cloak of Duck's feathers for the entire ship, so rain won't trickle down into the hold and leaks won't be a problem. Definitively not constant effect, I want the crew to be able to carry on board barrels of fresh water.
*Some way of turning salt water into fresh water...didn't we (relatively) recently have this discussion? How can this cat be skinned?
*Break the oncoming wave ReAq Base 5 according to ArM5 page 124. A device to activate when needed, to avoid large and dangerous waves.
*Clodless Sky Returned ArM5 page 128 PeAu30 or something like that. To use if a nasty weather phenomenon looms.
*Unravel the Fabric of Auram to remove magically created, nasty weather phenomena...or is Janus becoming paranoid? R:Sight and large enough to dispel magically created 'very severe weather'. Barring ritual spells these are at a maximum of level 50. A basic Unravelling at R:Sight stops spells of [level]+5+stress die. To be sure and not count on the die roll this needs to be a level 45 effect...I'll have to see if that is even possible...well, as lesser device, as invested it should be doable.
...I think maybe Janus needs to study a little Aquam, to get just a bit ahead of being merely grounded.