How about adding a Radar Ship? Radar distance and cost to be determined later. This would help making sea battles more manageable and could actually give sense to having some sort of defense fleet or some sort of ship wall.

Pan and scan, then fire missiles.

Easiest way would be an upgrade option on the present ship types, to mount Radar on them

I thought of something a while ago but forgot to post it here.
I'm fairly certain there are already several threads pertaining to this suggestion but I wanted to expand on it.

How about a mobile radar LAND unit? Now get this. If the radar land unit boards a transport, the transport becomes a radar ship. It's still a transport, except with radar ability.
This would remove the need for a whole new sea unit.

Also, upgradeable radar bases? L1 Radar provides the radar we get now, upwards to L9 radar that has about double the radar size?