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Using an Accuracy Statement

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Using an Accuracy Statement

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    1. Using an “Accuracy Statement” This guideline explains how the Accuracy Statement enhances your report to the Coast Guard and increases your credibility. An Accuracy Statement provides legal protection that your verification was performed at a high quality level. With the basic information provided by a complete Accuracy Statement, you are documenting the accuracy of the equipment that is used to determine the Lat/Long and the depth of water in your report.This guideline explains how the Accuracy Statement enhances your report to the Coast Guard and increases your credibility. An Accuracy Statement provides legal protection that your verification was performed at a high quality level. With the basic information provided by a complete Accuracy Statement, you are documenting the accuracy of the equipment that is used to determine the Lat/Long and the depth of water in your report.

    2. This is a standard “Accuracy Statement” ACCURACY STATEMENT: A Garmin GPS 76 GPS with WAAS enabled, operating in 3D Differential was used to fix the aid. On-scene EPE was 7.0 feet. Pre-underway accuracy was checked with another GPS. A Hummingbird Wide 100 echo sounder was used to take the depth. Pre-underway accuracy was checked at the dock with a hand-held echo sounder. Correction for the transducer is 0.8 feet. The on-scene Substation was Neponset River on Boston. The reported fix and depth were taken approximately 3 feet from the aid. 2 This is a standard statement that I use. It shows the equipment that you are using – GPS and Echo Sounder. It explains how you checked that this equipment before getting underway. It provides quality control data while you were on scene. And, if necessary, indicates the distance that your vesseil was off the aid when the readings were taken.This is a standard statement that I use. It shows the equipment that you are using – GPS and Echo Sounder. It explains how you checked that this equipment before getting underway. It provides quality control data while you were on scene. And, if necessary, indicates the distance that your vesseil was off the aid when the readings were taken.

    3. Some Contents of the “Accuracy Statement” are fixed Manufacturer’s name and model numbers of electronic measuring equipment being used. Special GPS features that measure quality. A digital record of the equipment being used is established. The next slide shows this data. 3

    4. ACCURACY STATEMENT: A Garmin GPS 76 GPS with WAAS enabled, operating in 3D was used to fix the aid. On-scene EPE was 7.0 feet. Pre-underway accuracy was checked with another GPS. A Hummingbird Wide 100 echo sounder was used to take the depth. Pre-underway accuracy was checked at the dock with a hand-held echo sounder. Correction for the transducer is 0.8 feet. The on-scene Substation was Neponset River on Boston. The reported fix and depth were taken approximately 13 feet from the aid. 4

    5. Pre-underway Check Review of Measuring Equipment Step 1 – The GPS is checked. Step 2 – The Echo Sounder is checked. The next slide shows how you validated the accuracy of your electronic measuring equipment before getting underway. 5

    6. ACCURACY STATEMENT: A Garmin GPS 76 GPS with WAAS enabled, operating in 3D Differential was used to fix the aid. On-scene EPE was 7.0 feet. Pre-underway accuracy was checked with another GPS. A Hummingbird Wide 100 echo sounder was used to take the depth. Pre-underway accuracy was checked at the dock with a hand-held echo sounder. Correction for the transducer is 0.8 feet. The on-scene Substation was Neponset River on Boston. The reported fix and depth were taken approximately 13 feet from the aid. 6

    7. On Scene Equipment Accuracy checks GPS quality checks: Record the 3D – needs 4 or more satellites. Record the EPE – should be under 20 feet, or Record the HDOP – should be between 1 and 2 Echo Sounder quality checks: Sanity check for accuracy. Record the H.O.T. – Height of Tide. Record the Substation used. Distance off PATON. Record on the Accuracy Statement. The next slide demonstrates this data. 7

    8. ACCURACY STATEMENT: A Garmin GPS 76 GPS with WAAS enabled, operating in 3D was used to fix the aid. On-scene EPE was 7.0 feet. Pre-underway accuracy was checked with another GPS. A Hummingbird Wide 100 echo sounder was used to take the depth. Pre-underway accuracy was checked at the dock with a hand-held echo sounder. Correction for the transducer is 0.8 feet. The on-scene Substation was Neponset River on Boston. The reported fix and depth were taken approximately 13 feet from the aid. 8

    9. Four Easy Steps Step 1. Maintain a copy of an “Accuracy Statement” on your computer’s desktop, updated with the fixed features of your GPS and Echo Sounder. Usually, this data doesn’t change. Step 2. Update with your pre-underway data checks. Normally, this data stays the same for the PATONs being verified during the same patrol. Step 3. Update with your on scene data checks. This data is for a specific PATON. Step 4. Copy and paste the “Accuracy Statement” to your “7054 AV Verification Report.” 9

    10. 7054 Verification Report Copy the “Accuracy Statement” from your desktop and paste it to your “7054 AV Verification Report.” A special field is provided for this purpose. 10

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