Surface Clutter News Today

The latest on the investigation. >> reporter: off the coast of malaysia the search for flight 370 has now entered its fourth day. dozens of ships, helicopters, and planes running grid-like searches in the waters between malaysia and vietnam. so far nothing. an oil sheen and debris spotted over the weekend ended up being false leads. now sea conditions are expected to worsen. on board the "uss blueridge," commander william marks. >> that will make search conditions more challenging. although i ca...

The latest on the investigation. >> reporter: off the coast of malaysia the search for flight 370 has now entered its fourth day. dozens of ships, helicopters, and planes running grid-like searches in the waters between malaysia and vietnam. so far nothing. an oil sheen and debris spotted over the weekend ended up being false leads. now sea conditions are expected to worsen. on board the "uss blueridge," commander william marks. >> that will make search conditions more challenging. although i ca...

>> reporter: the search for flight 370 has entered fourth day. dozens of ships and helicopters and planes running grid like searches in the waters between malaysia and vietnam. so far, nothing. an oil sheen and debris spotted over the weekend ended up being false leads an now sea conditions are expected to worsen. on "blue ridge" the commander. >> that will make search conditions more challenging but i can tell you our radars are very advanced and they can actually negate a lot of that surface c...

Nbcs tom costello whas the latest. >> reporter: the search for flight 370 has entered fourth day. dozens of ships and helicopters and planes running grid like searches in the waters between malaysia and vietnam. so far, nothing. an oil sheen and debris spotted over the weekend ended up being false leads an now sea conditions are expected to worsen. on "blue ridge" the commander. >> that will make search conditions more challenging but i can tell you our radars are very advanced and they can actu...

I can tell you our radars are very advanced and they can negate a lot of the surface clutter. but it does present a challenge for this big international effort. >> reporter: the last reported location for the boeing 777 was over the water halfway between malaysia and vietnam. but with radar suggesting the plane may have started to turn back, the search zone is expanding to include malaysias mainland and now the waters to the northwest. among the questions why would the plane turn back, and why d...