NAVIGATION ASSISTANCE DEVICE, NAVIGATION ASSISTANCE METHOD, AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM

A navigation assistance device including processing circuitry configured to: acquire first ship data including a position and a speed of a first ship; acquire second ship data including a position and a speed of a second ship; identify a risk area where a risk of the first ship and the second ship approaching each other is equal to or greater than a particular value; calculate an arrival time until the first ship arrives at the risk area; and display the risk area and display the arrival time in association with the risk area.