The artist used a methodical style to depict the Dutch coastline. In works like "The Postilion Receives the Dispatches from the Long-boat," he prioritised technical accuracy. His compositions often feature the postilion, a figure responsible for transporting letters across the dunes. Van Geel balanced the wide horizons of the Brielle region with functional details of maritime life. He avoided romanticised storms, preferring the steady reality of daily transport.

Modern collectors value Van Geel for his clarity and historical precision. His maps and coastal scenes offer a structured view of the Dutch Golden Age. The "Kaart van de Maasmonding" provides a sense of order and scale. These prints appeal to those who appreciate the history of communication and early mapmaking. His work is a record of how people stayed connected across distances.