> too cold for air to air missiles I'm guessing that these days there are two kinds of airborne objects: multi-modal drones and targets. Oddly enough, heat se

> too cold for air to air missiles I'm guessing that these days there are two kinds of airborne objects: multi-modal drones and targets. Oddly enough, heat seeking air to air came in ca.1950s, so self-flying has been around a while, and now people (especially those with heavy logistics requirements) are talking about land based self-driving, but shouldn't the seas be an intermediate problem? Where did all the self-sailing vessels go?