1 Catch Monitoring Systems Market Overview
1.1 Product Definition
1.2 Catch Monitoring Systems Segment by Type
1.2.1 Global Catch Monitoring Systems Market Value Growth Rate Analysis by Type 2022 VS 2029
1.2.2 Single Frequency （40 KHz Or 70 KHz）
1.2.3 Dual Frequency (40 KHz/70 KHz)
1.3 Catch Monitoring Systems Segment by Application
1.3.1 Global Catch Monitoring Systems Market Value Growth Rate Analysis by Application: 2022 VS 2029
1.3.2 Individual
1.3.3 Commercial
1.4 Global Market Growth Prospects
1.4.1 Global Catch Monitoring Systems Production Value Estimates and Forecasts (2018-2029)
1.4.2 Global Catch Monitoring Systems Production Capacity Estimates and Forecasts (2018-2029)
1.4.3 Global Catch Monitoring Systems Production Estimates and Forecasts (2018-2029)
1.4.4 Global Catch Monitoring Systems Market Average Price Estimates and Forecasts (2018-2029)
1.5 Assumptions and Limitations
2 Market Competition by Manufacturers
2.1 Global Catch Monitoring Systems Production Market Share by Manufacturers (2018-2023)
2.2 Global Catch Monitoring Systems Production Value Market Share by Manufacturers (2018-2023)
2.3 Global Key Players of Catch Monitoring Systems, Industry Ranking, 2021 VS 2022 VS 2023
2.4 Global Catch Monitoring Systems Market Share by Company Type (Tier 1, Tier 2 and Tier 3)
2.5 Global Catch Monitoring Systems Average Price by Manufacturers (2018-2023)
2.6 Global Key Manufacturers of Catch Monitoring Systems, Manufacturing Base Distribution and Headquarters
2.7 Global Key Manufacturers of Catch Monitoring Systems, Product Offered and Application
2.8 Global Key Manufacturers of Catch Monitoring Systems, Date of Enter into This Industry
2.9 Catch Monitoring Systems Market Competitive Situation and Trends
2.9.1 Catch Monitoring Systems Market Concentration Rate
2.9.2 Global 5 and 10 Largest Catch Monitoring Systems Players Market Share by Revenue
2.10 Mergers & Acquisitions, Expansion
3 Catch Monitoring Systems Production by Region
3.1 Global Catch Monitoring Systems Production Value Estimates and Forecasts by Region: 2018 VS 2022 VS 2029
3.2 Global Catch Monitoring Systems Production Value by Region (2018-2029)
3.2.1 Global Catch Monitoring Systems Production Value Market Share by Region (2018-2023)
3.2.2 Global Forecasted Production Value of Catch Monitoring Systems by Region (2024-2029)
3.3 Global Catch Monitoring Systems Production Estimates and Forecasts by Region: 2018 VS 2022 VS 2029
3.4 Global Catch Monitoring Systems Production by Region (2018-2029)
3.4.1 Global Catch Monitoring Systems Production Market Share by Region (2018-2023)
3.4.2 Global Forecasted Production of Catch Monitoring Systems by Region (2024-2029)
3.5 Global Catch Monitoring Systems Market Price Analysis by Region (2018-2023)
3.6 Global Catch Monitoring Systems Production and Value, Year-over-Year Growth
3.6.1 North America Catch Monitoring Systems Production Value Estimates and Forecasts (2018-2029)
3.6.2 Europe Catch Monitoring Systems Production Value Estimates and Forecasts (2018-2029)
3.6.3 China Catch Monitoring Systems Production Value Estimates and Forecasts (2018-2029)
3.6.4 Japan Catch Monitoring Systems Production Value Estimates and Forecasts (2018-2029)
4 Catch Monitoring Systems Consumption by Region
4.1 Global Catch Monitoring Systems Consumption Estimates and Forecasts by Region: 2018 VS 2022 VS 2029
4.2 Global Catch Monitoring Systems Consumption by Region (2018-2029)
4.2.1 Global Catch Monitoring Systems Consumption by Region (2018-2023)
4.2.2 Global Catch Monitoring Systems Forecasted Consumption by Region (2024-2029)
4.3 North America
4.3.1 North America Catch Monitoring Systems Consumption Growth Rate by Country: 2018 VS 2022 VS 2029
4.3.2 North America Catch Monitoring Systems Consumption by Country (2018-2029)
4.3.3 United States
4.3.4 Canada
4.4 Europe
4.4.1 Europe Catch Monitoring Systems Consumption Growth Rate by Country: 2018 VS 2022 VS 2029
4.4.2 Europe Catch Monitoring Systems Consumption by Country (2018-2029)
4.4.3 Germany
4.4.4 France
4.4.5 U.K.
4.4.6 Italy
4.4.7 Russia
4.5 Asia Pacific
4.5.1 Asia Pacific Catch Monitoring Systems Consumption Growth Rate by Region: 2018 VS 2022 VS 2029
4.5.2 Asia Pacific Catch Monitoring Systems Consumption by Region (2018-2029)
4.5.3 China
4.5.4 Japan
4.5.5 South Korea
4.5.6 China Taiwan
4.5.7 Southeast Asia
4.5.8 India
4.6 Latin America, Middle East & Africa
4.6.1 Latin America, Middle East & Africa Catch Monitoring Systems Consumption Growth Rate by Country: 2018 VS 2022 VS 2029
4.6.2 Latin America, Middle East & Africa Catch Monitoring Systems Consumption by Country (2018-2029)
4.6.3 Mexico
4.6.4 Brazil
4.6.5 Turkey
5 Segment by Type
5.1 Global Catch Monitoring Systems Production by Type (2018-2029)
5.1.1 Global Catch Monitoring Systems Production by Type (2018-2023)
5.1.2 Global Catch Monitoring Systems Production by Type (2024-2029)
5.1.3 Global Catch Monitoring Systems Production Market Share by Type (2018-2029)
5.2 Global Catch Monitoring Systems Production Value by Type (2018-2029)
5.2.1 Global Catch Monitoring Systems Production Value by Type (2018-2023)
5.2.2 Global Catch Monitoring Systems Production Value by Type (2024-2029)
5.2.3 Global Catch Monitoring Systems Production Value Market Share by Type (2018-2029)
5.3 Global Catch Monitoring Systems Price by Type (2018-2029)
6 Segment by Application
6.1 Global Catch Monitoring Systems Production by Application (2018-2029)
6.1.1 Global Catch Monitoring Systems Production by Application (2018-2023)
6.1.2 Global Catch Monitoring Systems Production by Application (2024-2029)
6.1.3 Global Catch Monitoring Systems Production Market Share by Application (2018-2029)
6.2 Global Catch Monitoring Systems Production Value by Application (2018-2029)
6.2.1 Global Catch Monitoring Systems Production Value by Application (2018-2023)
6.2.2 Global Catch Monitoring Systems Production Value by Application (2024-2029)
6.2.3 Global Catch Monitoring Systems Production Value Market Share by Application (2018-2029)
6.3 Global Catch Monitoring Systems Price by Application (2018-2029)
7 Key Companies Profiled
7.1 WESMAR
7.1.1 WESMAR Catch Monitoring Systems Corporation Information
7.1.2 WESMAR Catch Monitoring Systems Product Portfolio
7.1.3 WESMAR Catch Monitoring Systems Production, Value, Price and Gross Margin (2018-2023)
7.1.4 WESMAR Main Business and Markets Served
7.1.5 WESMAR Recent Developments/Updates
7.2 Scanmar
7.2.1 Scanmar Catch Monitoring Systems Corporation Information
7.2.2 Scanmar Catch Monitoring Systems Product Portfolio
7.2.3 Scanmar Catch Monitoring Systems Production, Value, Price and Gross Margin (2018-2023)
7.2.4 Scanmar Main Business and Markets Served
7.2.5 Scanmar Recent Developments/Updates
7.3 Furuno Norge
7.3.1 Furuno Norge Catch Monitoring Systems Corporation Information
7.3.2 Furuno Norge Catch Monitoring Systems Product Portfolio
7.3.3 Furuno Norge Catch Monitoring Systems Production, Value, Price and Gross Margin (2018-2023)
7.3.4 Furuno Norge Main Business and Markets Served
7.3.5 Furuno Norge Recent Developments/Updates
7.4 Simrad
7.4.1 Simrad Catch Monitoring Systems Corporation Information
7.4.2 Simrad Catch Monitoring Systems Product Portfolio
7.4.3 Simrad Catch Monitoring Systems Production, Value, Price and Gross Margin (2018-2023)
7.4.4 Simrad Main Business and Markets Served
7.4.5 Simrad Recent Developments/Updates
7.5 Marport
7.5.1 Marport Catch Monitoring Systems Corporation Information
7.5.2 Marport Catch Monitoring Systems Product Portfolio
7.5.3 Marport Catch Monitoring Systems Production, Value, Price and Gross Margin (2018-2023)
7.5.4 Marport Main Business and Markets Served
7.5.5 Marport Recent Developments/Updates
8 Industry Chain and Sales Channels Analysis
8.1 Catch Monitoring Systems Industry Chain Analysis
8.2 Catch Monitoring Systems Key Raw Materials
8.2.1 Key Raw Materials
8.2.2 Raw Materials Key Suppliers
8.3 Catch Monitoring Systems Production Mode & Process
8.4 Catch Monitoring Systems Sales and Marketing
8.4.1 Catch Monitoring Systems Sales Channels
8.4.2 Catch Monitoring Systems Distributors
8.5 Catch Monitoring Systems Customers
9 Catch Monitoring Systems Market Dynamics
9.1 Catch Monitoring Systems Industry Trends
9.2 Catch Monitoring Systems Market Drivers
9.3 Catch Monitoring Systems Market Challenges
9.4 Catch Monitoring Systems Market Restraints
10 Research Finding and Conclusion
11 Methodology and Data Source
11.1 Methodology/Research Approach
11.1.1 Research Programs/Design
11.1.2 Market Size Estimation
11.1.3 Market Breakdown and Data Triangulation
11.2 Data Source
11.2.1 Secondary Sources
11.2.2 Primary Sources
11.3 Author List
11.4 Disclaimer
Table 1. Global Catch Monitoring Systems Market Value by Type, (US$ Million) & (2022 VS 2029)
Table 2. Global Catch Monitoring Systems Market Value by Application, (US$ Million) & (2022 VS 2029)
Table 3. Global Catch Monitoring Systems Production Capacity (K Units) by Manufacturers in 2022
Table 4. Global Catch Monitoring Systems Production by Manufacturers (2018-2023) & (K Units)
Table 5. Global Catch Monitoring Systems Production Market Share by Manufacturers (2018-2023)
Table 6. Global Catch Monitoring Systems Production Value by Manufacturers (2018-2023) & (US$ Million)
Table 7. Global Catch Monitoring Systems Production Value Share by Manufacturers (2018-2023)
Table 8. Global Catch Monitoring Systems Industry Ranking 2021 VS 2022 VS 2023
Table 9. Company Type (Tier 1, Tier 2 and Tier 3) & (based on the Revenue in Catch Monitoring Systems as of 2022)
Table 10. Global Market Catch Monitoring Systems Average Price by Manufacturers (USD/Unit) & (2018-2023)
Table 11. Manufacturers Catch Monitoring Systems Production Sites and Area Served
Table 12. Manufacturers Catch Monitoring Systems Product Types
Table 13. Global Catch Monitoring Systems Manufacturers Market Concentration Ratio (CR5 and HHI)
Table 14. Mergers & Acquisitions, Expansion
Table 15. Global Catch Monitoring Systems Production Value by Region: 2018 VS 2022 VS 2029 (US$ Million)
Table 16. Global Catch Monitoring Systems Production Value (US$ Million) by Region (2018-2023)
Table 17. Global Catch Monitoring Systems Production Value Market Share by Region (2018-2023)
Table 18. Global Catch Monitoring Systems Production Value (US$ Million) Forecast by Region (2024-2029)
Table 19. Global Catch Monitoring Systems Production Value Market Share Forecast by Region (2024-2029)
Table 20. Global Catch Monitoring Systems Production Comparison by Region: 2018 VS 2022 VS 2029 (K Units)
Table 21. Global Catch Monitoring Systems Production (K Units) by Region (2018-2023)
Table 22. Global Catch Monitoring Systems Production Market Share by Region (2018-2023)
Table 23. Global Catch Monitoring Systems Production (K Units) Forecast by Region (2024-2029)
Table 24. Global Catch Monitoring Systems Production Market Share Forecast by Region (2024-2029)
Table 25. Global Catch Monitoring Systems Market Average Price (USD/Unit) by Region (2018-2023)
Table 26. Global Catch Monitoring Systems Market Average Price (USD/Unit) by Region (2024-2029)
Table 27. Global Catch Monitoring Systems Consumption Growth Rate by Region: 2018 VS 2022 VS 2029 (K Units)
Table 28. Global Catch Monitoring Systems Consumption by Region (2018-2023) & (K Units)
Table 29. Global Catch Monitoring Systems Consumption Market Share by Region (2018-2023)
Table 30. Global Catch Monitoring Systems Forecasted Consumption by Region (2024-2029) & (K Units)
Table 31. Global Catch Monitoring Systems Forecasted Consumption Market Share by Region (2018-2023)
Table 32. North America Catch Monitoring Systems Consumption Growth Rate by Country: 2018 VS 2022 VS 2029 (K Units)
Table 33. North America Catch Monitoring Systems Consumption by Country (2018-2023) & (K Units)
Table 34. North America Catch Monitoring Systems Consumption by Country (2024-2029) & (K Units)
Table 35. Europe Catch Monitoring Systems Consumption Growth Rate by Country: 2018 VS 2022 VS 2029 (K Units)
Table 36. Europe Catch Monitoring Systems Consumption by Country (2018-2023) & (K Units)
Table 37. Europe Catch Monitoring Systems Consumption by Country (2024-2029) & (K Units)
Table 38. Asia Pacific Catch Monitoring Systems Consumption Growth Rate by Region: 2018 VS 2022 VS 2029 (K Units)
Table 39. Asia Pacific Catch Monitoring Systems Consumption by Region (2018-2023) & (K Units)
Table 40. Asia Pacific Catch Monitoring Systems Consumption by Region (2024-2029) & (K Units)
Table 41. Latin America, Middle East & Africa Catch Monitoring Systems Consumption Growth Rate by Country: 2018 VS 2022 VS 2029 (K Units)
Table 42. Latin America, Middle East & Africa Catch Monitoring Systems Consumption by Country (2018-2023) & (K Units)
Table 43. Latin America, Middle East & Africa Catch Monitoring Systems Consumption by Country (2024-2029) & (K Units)
Table 44. Global Catch Monitoring Systems Production (K Units) by Type (2018-2023)
Table 45. Global Catch Monitoring Systems Production (K Units) by Type (2024-2029)
Table 46. Global Catch Monitoring Systems Production Market Share by Type (2018-2023)
Table 47. Global Catch Monitoring Systems Production Market Share by Type (2024-2029)
Table 48. Global Catch Monitoring Systems Production Value (US$ Million) by Type (2018-2023)
Table 49. Global Catch Monitoring Systems Production Value (US$ Million) by Type (2024-2029)
Table 50. Global Catch Monitoring Systems Production Value Share by Type (2018-2023)
Table 51. Global Catch Monitoring Systems Production Value Share by Type (2024-2029)
Table 52. Global Catch Monitoring Systems Price (USD/Unit) by Type (2018-2023)
Table 53. Global Catch Monitoring Systems Price (USD/Unit) by Type (2024-2029)
Table 54. Global Catch Monitoring Systems Production (K Units) by Application (2018-2023)
Table 55. Global Catch Monitoring Systems Production (K Units) by Application (2024-2029)
Table 56. Global Catch Monitoring Systems Production Market Share by Application (2018-2023)
Table 57. Global Catch Monitoring Systems Production Market Share by Application (2024-2029)
Table 58. Global Catch Monitoring Systems Production Value (US$ Million) by Application (2018-2023)
Table 59. Global Catch Monitoring Systems Production Value (US$ Million) by Application (2024-2029)
Table 60. Global Catch Monitoring Systems Production Value Share by Application (2018-2023)
Table 61. Global Catch Monitoring Systems Production Value Share by Application (2024-2029)
Table 62. Global Catch Monitoring Systems Price (USD/Unit) by Application (2018-2023)
Table 63. Global Catch Monitoring Systems Price (USD/Unit) by Application (2024-2029)
Table 64. WESMAR Catch Monitoring Systems Corporation Information
Table 65. WESMAR Specification and Application
Table 66. WESMAR Catch Monitoring Systems Production (K Units), Value (US$ Million), Price (USD/Unit) and Gross Margin (2018-2023)
Table 67. WESMAR Main Business and Markets Served
Table 68. WESMAR Recent Developments/Updates
Table 69. Scanmar Catch Monitoring Systems Corporation Information
Table 70. Scanmar Specification and Application
Table 71. Scanmar Catch Monitoring Systems Production (K Units), Value (US$ Million), Price (USD/Unit) and Gross Margin (2018-2023)
Table 72. Scanmar Main Business and Markets Served
Table 73. Scanmar Recent Developments/Updates
Table 74. Furuno Norge Catch Monitoring Systems Corporation Information
Table 75. Furuno Norge Specification and Application
Table 76. Furuno Norge Catch Monitoring Systems Production (K Units), Value (US$ Million), Price (USD/Unit) and Gross Margin (2018-2023)
Table 77. Furuno Norge Main Business and Markets Served
Table 78. Furuno Norge Recent Developments/Updates
Table 79. Simrad Catch Monitoring Systems Corporation Information
Table 80. Simrad Specification and Application
Table 81. Simrad Catch Monitoring Systems Production (K Units), Value (US$ Million), Price (USD/Unit) and Gross Margin (2018-2023)
Table 82. Simrad Main Business and Markets Served
Table 83. Simrad Recent Developments/Updates
Table 84. Marport Catch Monitoring Systems Corporation Information
Table 85. Marport Specification and Application
Table 86. Marport Catch Monitoring Systems Production (K Units), Value (US$ Million), Price (USD/Unit) and Gross Margin (2018-2023)
Table 87. Marport Main Business and Markets Served
Table 88. Marport Recent Developments/Updates
Table 89. Key Raw Materials Lists
Table 90. Raw Materials Key Suppliers Lists
Table 91. Catch Monitoring Systems Distributors List
Table 92. Catch Monitoring Systems Customers List
Table 93. Catch Monitoring Systems Market Trends
Table 94. Catch Monitoring Systems Market Drivers
Table 95. Catch Monitoring Systems Market Challenges
Table 96. Catch Monitoring Systems Market Restraints
Table 97. Research Programs/Design for This Report
Table 98. Key Data Information from Secondary Sources
Table 99. Key Data Information from Primary Sources
List of Figures
Figure 1. Product Picture of Catch Monitoring Systems
Figure 2. Global Catch Monitoring Systems Market Value by Type, (US$ Million) & (2022 VS 2029)
Figure 3. Global Catch Monitoring Systems Market Share by Type: 2022 VS 2029
Figure 4. Single Frequency （40 KHz Or 70 KHz） Product Picture
Figure 5. Dual Frequency (40 KHz/70 KHz) Product Picture
Figure 6. Global Catch Monitoring Systems Market Value by Application, (US$ Million) & (2022 VS 2029)
Figure 7. Global Catch Monitoring Systems Market Share by Application: 2022 VS 2029
Figure 8. Individual
Figure 9. Commercial
Figure 10. Global Catch Monitoring Systems Production Value (US$ Million), 2018 VS 2022 VS 2029
Figure 11. Global Catch Monitoring Systems Production Value (US$ Million) & (2018-2029)
Figure 12. Global Catch Monitoring Systems Production (K Units) & (2018-2029)
Figure 13. Global Catch Monitoring Systems Average Price (USD/Unit) & (2018-2029)
Figure 14. Catch Monitoring Systems Report Years Considered
Figure 15. Catch Monitoring Systems Production Share by Manufacturers in 2022
Figure 16. Catch Monitoring Systems Market Share by Company Type (Tier 1, Tier 2, and Tier 3): 2018 VS 2022
Figure 17. The Global 5 and 10 Largest Players: Market Share by Catch Monitoring Systems Revenue in 2022
Figure 18. Global Catch Monitoring Systems Production Value by Region: 2018 VS 2022 VS 2029 (US$ Million)
Figure 19. Global Catch Monitoring Systems Production Value Market Share by Region: 2018 VS 2022 VS 2029
Figure 20. Global Catch Monitoring Systems Production Comparison by Region: 2018 VS 2022 VS 2029 (K Units)
Figure 21. Global Catch Monitoring Systems Production Market Share by Region: 2018 VS 2022 VS 2029
Figure 22. North America Catch Monitoring Systems Production Value (US$ Million) Growth Rate (2018-2029)
Figure 23. Europe Catch Monitoring Systems Production Value (US$ Million) Growth Rate (2018-2029)
Figure 24. China Catch Monitoring Systems Production Value (US$ Million) Growth Rate (2018-2029)
Figure 25. Japan Catch Monitoring Systems Production Value (US$ Million) Growth Rate (2018-2029)
Figure 26. Global Catch Monitoring Systems Consumption by Region: 2018 VS 2022 VS 2029 (K Units)
Figure 27. Global Catch Monitoring Systems Consumption Market Share by Region: 2018 VS 2022 VS 2029
Figure 28. North America Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 29. North America Catch Monitoring Systems Consumption Market Share by Country (2018-2029)
Figure 30. Canada Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 31. U.S. Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 32. Europe Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 33. Europe Catch Monitoring Systems Consumption Market Share by Country (2018-2029)
Figure 34. Germany Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 35. France Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 36. U.K. Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 37. Italy Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 38. Russia Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 39. Asia Pacific Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 40. Asia Pacific Catch Monitoring Systems Consumption Market Share by Regions (2018-2029)
Figure 41. China Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 42. Japan Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 43. South Korea Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 44. China Taiwan Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 45. Southeast Asia Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 46. India Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 47. Latin America, Middle East & Africa Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 48. Latin America, Middle East & Africa Catch Monitoring Systems Consumption Market Share by Country (2018-2029)
Figure 49. Mexico Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 50. Brazil Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 51. Turkey Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 52. GCC Countries Catch Monitoring Systems Consumption and Growth Rate (2018-2023) & (K Units)
Figure 53. Global Production Market Share of Catch Monitoring Systems by Type (2018-2029)
Figure 54. Global Production Value Market Share of Catch Monitoring Systems by Type (2018-2029)
Figure 55. Global Catch Monitoring Systems Price (USD/Unit) by Type (2018-2029)
Figure 56. Global Production Market Share of Catch Monitoring Systems by Application (2018-2029)
Figure 57. Global Production Value Market Share of Catch Monitoring Systems by Application (2018-2029)
Figure 58. Global Catch Monitoring Systems Price (USD/Unit) by Application (2018-2029)
Figure 59. Catch Monitoring Systems Value Chain
Figure 60. Catch Monitoring Systems Production Process
Figure 61. Channels of Distribution (Direct Vs Distribution)
Figure 62. Distributors Profiles
Figure 63. Bottom-up and Top-down Approaches for This Report
Figure 64. Data Triangulation
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