System and method of tilt sensor tide and inland water level gauge

A method of measuring tides and inland water levels, comprising:

• a computer receiving a first measurement of an angle formed by a first ray comprising a vertical fixed piling and a second ray formed by a downward sloping ramp of known length, a lower end of the ramp contacting a surface of a dock float and the surface representing a plane contacting the fixed piling at a 90-degree angle at a first meeting point;
• the computer calculating, based on the first measurement, based on the ramp length, and based on the 90-degree angle, a first distance from the first meeting point to a vertex of the angle;
• the computer receiving, after a time period, a second measurement of the angle, wherein the plane meets the piling at a second meeting point;
• the computer calculating, based on the second measurement, based on the ramp length, and based on the 90-degree angle, a second distance from the second meeting point to the vertex;
• and
• the computer expressing a difference between the first distance and the second distance as a tidal change.