While there's no easy in game method for determining the location of all of your ships, don't forget that the asset window does have a search feature. For instance, if you're looking for your prized Ferox, you can search for Ferox in the asset window and it will give you the location of any Feroxes (Feroxen?) that you may own.
Additionally, when looking at assets for a particular station, you can sort the assets by volume. Generally speaking, this will put all of your ships at the top (or bottom) of the asset list as you're not likely to own much that's bigger than a ship.
Lastly, I've not used it myself, but according to one of my alliance mates, EveHQ may be able to provide exactly what you're looking for. Apparently the asset manager in the program is very full featured. http://www.evehq.net/
T3 Boosting alts are very difficult to scan down. The T3 boats already have a reasonably small signature, but as well as that they often fit ECCM mods which make the scanning signature even harder to scan.
In saying that though, it is possible. In a recent patch (6 months or so ago I think?), they changed these fits to not be unscannable anymore. It still takes a long time to narrow it down though, as you have to usually scan right down to .25AU on the probe radius to get a %100 hit. Where someone is "soloing" and only uncloaking/boosting while they are actually fighting, then you usually only have a limited window, as these fights don't last very long. I guess you're sorta hoping for someone to leave their boosting alt uncloaked, and not watching directional scan. You're also a little bit more likely to be able to scan these down if they are in a bigger fleet fight, which tend to last a lot longer.
Some of these fits are very pimped, and can only be scanned down with :
a perfectly skilled scanning character. Just the skill names start with Astrometric, plus the Covert Ops ship skill.
using scanning implants. There is a set called Low Grade Virtue, which is expensive but helps a lot, these go in slots 1 - 5. There are other implants with "prospector" in the name which help too, which go in slots 6, 7 and 8. On the plus side, even though the implants are expensive, the scanning character will usually be very difficult to kill if he stays in a covert ops boat.
using a covert ops frigate, fitted with two Gravity Capacitor rigs, Sisters Expanded Probe Launcher (or the Tech 2 version), and using the Sisters Combat Probes.
Check out the eve online wiki page http://wiki.eveonline.com/en/wiki/Probing for the full names of skills and implants that will help.
The other thing that having combat scanning probes out will often do is cause the character to cloak the boosting alt back up again, losing them their link bonuses. While it won't net you a ridiculously sweet killmail, just stopping their boost alt from boosting can help a lot in some cases. Sometimes this may be the far easier thing to accomplish. A skilled player with a boosting character will often watch to make sure they only cloak when the scanning probes are closing in. Not everyone who can afford a boosting alt is a skilled player though... :)
Best Answer
There is an excellent guide available over at the EVE Wiki if you want more details, but in short there are three factors governing how many drones you can field:
I suppose it's technically possible to load some in there, launch the drones you have, then crossload and launch more, but it'd only be an useful option in a vanishingly small cross section of ships and no help at all if you for some reason need to leave quickly.Actually, that's not possible.TL;DR Until you get to capital ships (IE, carriers and motherships) there is no way you'll be able to control more than five drones at once. That said, with the right rigging and training, five tech2 heavy drones can do truly ridiculous amounts of damage. Ask your local Gallente ship dealer for a demonstration of the Ishtar.