# US 2017/0284807 A1 · Computer-readable recording medium, evaluation method, and evaluation device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0284807 A1 - Document ID: US20170284807A1 - Status: Published application - Kind: A1 - Application number: 15/415,240 - Filed: 2017-01-25 - Published: 2017-10-05 - Earliest claimed: 2016-03-31 - Assignees: Fujitsu Limited - Applicants: Fujitsu Limited - Inventors: Takahiro SAITO - Web page: https://patentgrep.com/patent/US20170284807A1 ## CPC - G01C 21/203: {specially adapted for water-borne vessels} - B63B 49/00: Arrangements of nautical instruments or navigational aids (nautical measuring instruments G01C; radio navigation, analogous arrangements using other waves G01S) - G01S 13/937: of marine craft - G08G 3/00: Traffic control systems for marine craft (marking of navigational route B63B22/16, B63B51/00) - G08G 3/02: Anti-collision systems - B63B 43/00: Improving safety of vessels, e.g. damage control, not otherwise provided for (fire-fighting in ships A62C3/10) - G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S) - B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93}) ## Abstract A non-transitory computer-readable recording medium stores a program that causes a computer to execute a process. the process includes extracting a sailing log of a ship in a sea area with a sailing route existing therein, the sea area being such that a distance between two ships of the ship and another ship is less than a predetermined value and at least one of the two ships has a ship track deviating from the sailing route; and evaluating risks at a plurality of points that are included in the sea area, based on the extracted sailing log. ## Claims ### Claim 1 A non-transitory computer-readable recording medium having stored therein a program that causes a computer to execute a process comprising: extracting a sailing log of a ship in a sea area with a sailing route existing therein, the sea area being such that a distance between two ships of the ship and another ship is less than a predetermined value and at least one of the two ships has a ship track deviating from the sailing route; and evaluating risks at a plurality of points that are included in the sea area, based on the extracted sailing log. ### Claim 2 (depends on 1) The non-transitory computer-readable recording medium according to claim 1, wherein the extracting includes: determining, as the ship track deviating from the sailing route, a ship track with the at least one of the two ships departing from a center line of the sailing route during a period of time when a distance of closest approach between the two ships is reduced to a value less than the predetermined value and subsequently changed to a value greater than or equal to a predetermined second value that is greater than the predetermined value in a case where the two ships maintain courses and speeds thereof. ### Claim 3 (depends on 1) The non-transitory computer-readable recording medium according to claim 1, wherein the extracting includes: determining, as the ship track deviating from the sailing route, a ship track with an angle of a course of at least one ship among the two ships with respect to a center line of the sailing route at predetermined first timing during a period of time when a distance of closest approach between the two ships is reduced to a value less than the predetermined value and subsequently changed to a value greater than or equal to a predetermined second value that is greater than the predetermined value in a case where the two ships maintain courses and speeds thereof being greater than an angle of a course of the one ship with respect to the center line of the sailing route at predetermined second timing before the period of time and being greater than or equal to a predetermined threshold. ### Claim 4 (depends on 1) The non-transitory computer-readable recording medium according to claim 1, wherein the extracting includes: expecting the distance between two ships, provided that a ship sailing on the sailing route among the two ships sails along the sailing route. ### Claim 5 (depends on 1) The non-transitory computer-readable recording medium according to claim 1, wherein the program causes a computer to execute a process comprising: changing the predetermined value greatly as increasing a width of the sailing route is increased or a terminal of the sailing route is approached. ### Claim 6 An evaluation method comprising: Extracting, by a processor, a sailing log of a ship in a sea area with a sailing route existing therein, the sea area being such that a distance between two ships of the ship and another ship is less than a predetermined value and at least one of the two ships has a ship track deviating from the sailing route; and evaluating, by the processor, risks at a plurality of points that are included in the sea area, based on the extracted sailing log. ### Claim 7 An evaluation device comprising: a processor that executes a process, the process comprising: extracting a sailing log of a ship in a sea area with a sailing route existing therein, the sea area being such that a distance between two ships of the ship and another ship is less than a predetermined value and at least one of the two ships has a ship track deviating from the sailing route; and evaluating risks at a plurality of points that are included in the sea area, based on the extracted sailing log.