Convenient linear interpolation of numbers, angles, times, feet/inches or any combination of these.

Product Description: Many field operations in engineering rely on interpolating data from printed or electronic tables. This is a special challenge in marine navigation where the need occurs frequently in all classes of vessels from ships to private yachts. InterpPlus solves these interpolations with a fast and convenient interface. The app can also be used for linear extrapolation. Examples provided include:

• finding compass headings from a deviation table
• estimating mid-day temperatures from morning and afternoon data
• finding dew point and relative humidity from tables.
• interpolating isobars on weather maps
• finding sunrise times on days not tabulated