Naval combat without radio or radar

How would the absence of radio and radar change Second World War naval combat?

Reconnaissance, long-range attack, and fleet coordination would collapse toward visual, local control despite otherwise modern ships and aircraft.

Without radar, detection and interception become far less reliable; without radio, coordinating forces over distance becomes nearly impossible. Navies might compensate with exceptional optical instruments and more developed acoustic listening, but the resulting warfare would still resemble age-of-sail command with modern equipment.