Nautical Calculator

Calculate distance and travel time between 200+ destinations on the Great Lakes! Great for route planning, vacation trips, the Great Loop or just a weekend getaway. Nautical Calculator also includes near shore forecasts and 120 hour wind & wave forecast maps for all five lakes.

Nautical Calculator allows you to select your starting point and end destination along with your anticipated speed. Once entered, you will get a distance (nautical or statute miles) calculated from common navigational routes along with an approximate travel time.

Know before you go. Take a look ahead at what the lake conditions will be with Nautical Calculator forecast maps built from NOAA data. Avoid rough water or choose the best days for sailing. Don’t leave port without it!