Parker Maritime can establish the distance from a platform topside to the sea surface. The vertical distance between the lowest point of the installation’s topside and the lowest astronomical tide (LAT) is defined as the “Airgap”. Distance measurement - Laser measurements from platform to sea level - Distance accuracy better than 20mm - Sampling rate is better than every two seconds - Relative to the installation coordinate system - Platform inclination survey (optional) - Air pressure logging A laser is mounted to measure from a reference onboard the installation. Continuous measurements are done over a period of approximately 35 days. A special program is used to extract the data and present the sea level over time relative to the installation. | 
