NavCalc Dynamic vs Level

NavCalc is a simple navigation calculator. Given a desired heading, boat speed, and the set and drift of current, NavCalc will display the Course to Steer (CtS) and Speed over Ground (SoG) that will be achieved on that course given the current. NavCalc draws a neat little picture of the heading, current vector, and course to steer on a 360º compass rose which includes both degrees True and Magnetic (if you enter a Magnetic Variation). NavCalc also allows you to enter degrees of leeway and wind direction, and will take leeway into account when calculating the CtS. NavCalc will dynamically update the drawing as you change any of the parameters (heading, boat speed, current set or drift, variation). NavCalc can be used to solve navigation problems like the ones you might find on the tests for Coastal Navigation courses from US Sailing or ASA. It’s also useful for building intuition about how current affects your boat’s course and speed over ground (or velocity made good) since it updates dynamically as you change any parameter.

Aluminium Level turns your iPhone into a fast, accurate spirit level for everyday leveling, hanging, and DIY jobs. A clean aluminium-and-lime interface, built for landscape, gives you a clear read at a glance. THREE WAYS TO MEASURE - Bullseye (surface) level: a bubble that drifts off-centre when a surface tilts in any direction, turning green as you reach true level. - Tube / vial level: a classic single-axis vial for quick edge checks. - Edge level: a focused bar for plumbing verticals and leveling horizontals. LIVE READOUTS - Real-time pitch and roll angles, updated as you move. - Switch units between degrees, percent slope, and inches-per-foot. - A satisfying chime and haptic tap confirm the moment you hit level. BUILT FOR REAL WORK - One-tap calibration zeroes out any reference surface, so a slightly uneven phone never throws off your reading. - Hold/freeze captures a reading in awkward spots where you can't see the screen. - Reset returns to factory zero anytime. - Landscape, full-screen layout with large, readable values. No accounts, no clutter — open it and measure. Whether you're hanging a picture, leveling a shelf, checking a table, setting tile, or framing, Aluminium Level keeps it simple and precise. REMOVE ADS Prefer an ad-free experience? A one-time Remove Ads purchase clears all ads forever and supports independent development. Every measuring tool stays free.