Grant is best known for his maritime works and his book Sail Ho! He used a loose pen line to depict life on the water. His drawings focus on the physical labour of sailors and the movement of the ocean. Grant prioritised the character of the crew over stiff technical diagrams. His figures appear active and authentic. He avoided overly formal compositions in favour of scenes that feel immediate.

Modern collectors value Grant for his ability to document a disappearing era of sail. His prints bring a sense of adventure to a room without appearing dated. The clarity of his line work makes his art suitable for contemporary interiors. His focus on the relationship between man and the sea provides a classic subject matter. These works offer a window into maritime history through a skilled hand.