Merope 5c has a radius of 1478km. If my math skills have not deserted me, this means a diameter of 2956 km, so a pole-to-pole route would be 2956 * Pi/2 km or about 4643 km long. The top speed of an SRV is about 35 m/s, so this would take about 1.5 days of round-the-clock driving time if we can keep top speed all the time. If we hit rough terrain (and Merope 5C has a lot of that), the speed will be lower. My gut guess is that the average speed is maybe a third of the top speed, so we are talking about 4.5 days. However, there is one show-stopper: At the equator, you would have a distance of 2956 km * PI / 36 = 258 km between SRVs, so we would miss stuff.
My estimate is that the scanner has a range of maybe 1 km. To ensure that we really cover everything, we need to place the SRVs 1 km apart at the equator, and then all drive to the pole, return to the equator, and repeat the procedure for the second half. We only need about 9300 commanders for this.
Piece of cake.
Thank you for the math and showing up the real dimensions of what a search would be like
So essentialy, for the moment, finding "something" would be just a coincidence.
What i think:
We do not have the "tools" yet to discover, what makes UA's point at Merope and UP's point at Merope 5C. The directions we got, got more precise with the UP's, but look at the scale. From a game designer perspective, it is hard to believe, that developers really expect a community to accomplish a task like that. Not only because of dimension, but also in terms of organisation. Just think again about the dimensions of Udo's math on the scale.
Which brings me to the following :
The whole "UA/UP Thing" evolved.
"Directional/Positional" Informations got more detailed by time. We are lacking the next step of detailing the information aka a narrowed down search area on the surface.
(What if, whatever we are supposed to find, is not even there, yet ? Just think about searching for something, that is not there, just because we did not advance in the "UA/UP-Storyline", yet

)
However, i will continue to search the surface. You never know ... and i'm maybe completely wrong with my thinking .
o7