Propeller Calc vs Mariner Check

This calculator can determine pitch, gear ratio, RPM, propeller slip and speed parameters. Enter any four variables, and it will calculate the fifth. Use the toggle switch to choose which field to calculate. Pitch is the theoretical forward movement for one complete turn of the propeller. Every inch of the boat in contact with the water induces drag. Therefore, the distance travelled differs since the propeller is "slipping" behind the theoretical distance it should travel with each rotation. The difference between theory and reality is called slip. Depending on your application, slip typically ranges between 5% and 20%. A lower number is only sometimes what you are after. Slip of a prop changes with operating conditions and is not a direct measure of efficiency. Please consult professionals for guidance. Happy powerboating

Mariner Check helps professional mariners keep important credentials organized and renewal dates visible in one convenient place. Quick glances on the app or widget to ensure your hitch goes smoothly. Track your USCG Merchant Mariner Credential, medical certificate, TWIC, TSA PreCheck, flag-state credentials, Dynamic Positioning certificate, Benzene Card, and other custom licenses, courses, or documents. Key features: • View valid, upcoming, scheduled, and expired credentials at a glance • Set a custom renewal monitoring window for each credential • Receive reminders as expiration dates approach • Track multiple medical expiration dates, including National, STCW, and Pilot dates • Schedule renewal appointments and optionally add them to your calendar • See credential status from your Home Screen widget • Sync securely across your Apple devices with iCloud • Access your information offline • Mask credential numbers for additional privacy • Store issuing authorities, identification numbers, issue dates, and notes Whether you manage one credential or an entire collection of maritime documents, Mariner Check makes it easier to stay prepared and begin renewals on time. Mariner Check is an organizational tool and does not verify legal, medical, employer, flag-state, or regulatory compliance. Always confirm requirements with the appropriate issuing authority. #Fort Schuyler