Playing around with planetary defenses, came upon a curious feature of MT design: undetectable sensors. MegaTrav uses pinpoint sensors to gain a lock on targets to shoot at them. Pinpoint sensors include active EMS (basically radar and similar), densitometers, and neutrino sensors. The latter two are considered passive sensors - they don't emit anything you can detect, but instead try to detect something you're emitting. What this basically means is that of the three targeting sensors, two can't be detected. That's trickier at lower levels - TL13 and down sensors have a harder roll to lock onto the target. You get one free roll and a second if you have no weapons batteries; if you have weapon batteries, you can forego firing a weapon battery and get another roll. I don't think there's any limit on how many battery attacks you can forego. Once you have a lock, any of your craft can fire at that target, so if you have enough batteries to forego or enough independent platforms rolling that one scan, you start approaching a statistical certainty of a lock.
Per canon, deep meson sites can only be silenced by taking out their sensors: you roll as if they were a ship or boat, but only the sensor hits have an effect. That effect is to destroy one or more sets of sensors, attacker chooses type. However, as described you can't detect densitometers or neutrino sensors and - presumably - such detectors can be placed underground and the site camouflaged to look like any other patch of ground. You might find densitometers by scanning with your own densitometers - I suspect burying them any significant depth would interfere with their function - but a planet is a huge place; you're looking for a needle in a haystack. Neutrino sensors though, they can be as deep as the meson battery itself, which logically means they can't be silenced. They can also be used for passive scan.
That's a bit of a problem.
Per canon, deep meson sites can only be silenced by taking out their sensors: you roll as if they were a ship or boat, but only the sensor hits have an effect. That effect is to destroy one or more sets of sensors, attacker chooses type. However, as described you can't detect densitometers or neutrino sensors and - presumably - such detectors can be placed underground and the site camouflaged to look like any other patch of ground. You might find densitometers by scanning with your own densitometers - I suspect burying them any significant depth would interfere with their function - but a planet is a huge place; you're looking for a needle in a haystack. Neutrino sensors though, they can be as deep as the meson battery itself, which logically means they can't be silenced. They can also be used for passive scan.
That's a bit of a problem.