<p>During maritime navigation, the operational reliability of onboard communication and radar equipment systems is disrupted by wave-induced vessel motions. To ensure the stable performance of these critical systems, a marine dual-axis compensation platform is developed for active roll and pitch motion compensation. However, the stochastic nature of wave disturbances and the nonlinear characteristics of permanent magnet synchronous motors significantly complicate precise motion compensation. To address these limitations, a triple-loop coordinated controller architecture is proposed in this study. In this architecture, the outer position loop implements linear active disturbance rejection control (LADRC) to estimate and compensate for total position disturbance. A sliding mode control (SMC)-based velocity loop facilitates steady velocity adjustment, whereas an inner current loop leverages internal model control (IMC) to decouple cross-coupled electromotive forces and simplify parameterization. Simulation results for vessel motion reveal that the proposed LADRC–SMC–IMC hybrid system enhances compensation accuracy and stability by approximately 46.6% and 39%, respectively, compared with the triple-loop proportional–integral (PI) controller. Experimental validation of the simulation results confirms that the proposed system improves compensation accuracy by approximately 21.8%, exhibiting comparable compensation stability with that of the PI controller. Actual vessel tests confirm that the LADRC–SMC–IMC controller effectively compensates for vessel motion disturbances under Sea State II conditions. Notably, the numerical simulations and physical experiments confirm the effectiveness and viability of the architecture, underscoring its substantial application potential for marine motion compensation systems.</p>