Search continues for missing American sailor Donald Lawson after capsized boat found off Mexico

Donald Lawson went missing while sailing from Acapulco to Panama on July 13
Lawson was attempting to break the record for fastest solo circumnavigation by an African American
The Mexican Navy found Lawson's capsized trimaran Defiance, but could not approach due to bad weather
Lawson left Acapulco on July 5 but had to turn back after engine failure on his 60-foot boat
Mexico's maritime search and rescue unit is leading efforts to find Lawson