The 2nd mission

The Stormraven will need to be piloted until the landing zone his identified.
It has a front-mounted, twin linked assault cannon and four missiles controlled by the pilot.
As well as a twin-linked heavy bolters in an overhead turret.
The ship's auspex can be used to detect groups of tyranids before they can see you through the smoke.
Librarians can use psyniscience to pinpoint the origin of the signal.
There will be a check every hour until you find the zone or attract too much attention. There is a crew do fill the positions if you do not, but they are not Space Marines.
Tell your positions and happy hunting!

BS 59.... if anybody has a higher rating, I'll leave him the spot.

I think the pilot (any) skill is a rank 3 skill in the space marine advance chart, so nobody can have it. (Unless I missed it on another chart...)

Using the Tactics (Recon & Stealth) to aid the pilot...if I can...

@deadpool A succesfull Tactics (Recon and stealth) will help mitigate a failed auspex test.

In this case, a co-pilot to use a front mounted weapon if need be seems reasonable.

Rolls needed
Awareness on the auspex to avoid encounters
Tactics( recon and stealth) as backup
Psynyscience to start pinpointing the signal

Tactics: Recon & Stealth...result (38), sucess

Including a Tech Use roll to spot things not normally detectable to human senses alone, such as invisible gases, nearby bio-signs, or ambient radiation.

I'll need the same rolls again for the next hour of search

Another roll, another hour!