If your ham sandwich just floated by, you might need a rescue. Getting one in time to save your life will depend on advance preparation and having a life jacket already buckled firmly in place.
Being able to call for help at any range is the next hurdle. A VHF radio and a waterproof handheld for backup are mandatory but limited in range.
For...
Lowrance's engineers designed the BR 24 to work with their HDS chartplotters and provide incredibly detailed radar images while using less power than navigation lights.