Technology for determining a point-to-point separation between a first ship (e.g., guide ship) and a second ship (e.g., following ship) is disclosed. One approach can include maritime autonomous station keeping (MASK) interactive device comprising a communication module and a processor. The communication module can be configured to receive a following ship reference point (SRP) generated by at least one differential global positioning system (DGPS) receiver on a following ship relative to a guide SRP generated by at least one DGPS receiver on a guide ship. The processor can be configured to generate a plurality of fixed following reference edge points (REPs) relative to the following SRP representing a following ship hull, generate a plurality of fixed guide REPs relative to the guide SRP representing a guide ship hull, and monitor a plurality of distances between the plurality of following REPs and the plurality of guide REPs.