[Fyron]

Hmmmm...then long range scanners and scanner jammers only have a use prior to combat? Like whether to flee or attempt to engage in combat?

Once you have encountered a ship design in combat once, you can always see it's design later. So, scanner jammers on non-cargo ships are only useful for brand-new, top secret designs. Once you use the ships, the enemy will always be able to know their designs. After the enemy has seen your ships in combat, the only thing that the scanner jammer can do is prevent them from seeing if your ships are damaged or not and what cargo (if any) they carry.

By detected, I assume you mean their components and cargo are shown.

Cloaked ships are hidden on the strategic map outside of combat (unless the enemy has an appropriate level tachyon-type scanner, of course). Once in combat, the cloaking device does nothing for the ship. Stealth Armor still provides the +5, 10 or 15 to hit penalty, but the cloaking aspect doesn't function during combat.