Planning a boat route is not complicated once you know the steps: you set waypoints from your start to your destination, read the distance and heading for each leg, estimate how long it will take and how much fuel you will burn, and check the plan against hazards and weather before you go. This guide walks through how to plan a boat route from scratch, whether you use a paper chart or an app.
For context: Marine OS is marina management software, and we are building a route planner for boaters. The method below applies to any tool you choose.
- A route is a series of waypoints connected into legs, each with a distance and a bearing to steer.
- ETA comes from distance divided by your planned speed; fuel from your burn rate times the hours.
- Check every leg against the chart for depth and hazards before you commit to the route.
- Weather and tide can change a good route into a bad one, so plan the timing, not just the line.
- Save and export the route so you can follow it and reuse it later.
#Step 1: Set your start and destination
Begin with the two fixed points: where you are leaving from and where you are going. On an app you tap or search for each; on a chart you mark them. This gives you the straight-line, or rhumb-line, distance, which is the baseline before you add waypoints to keep the route safe and practical.
#Step 2: Add waypoints to keep the route safe
A straight line between two harbors often crosses shoals, land, or restricted areas. Waypoints are the intermediate marks you drop to route around those. Place them at turns, at the entrances to channels, and wherever you need to give a hazard a safe berth. Each waypoint splits the route into a leg with its own distance and bearing.
- Put waypoints at course changes and channel entrances, not randomly.
- Give hazards a safe margin, allowing for tide, leeway, and GPS error.
- Keep legs simple enough to steer and monitor without constant adjustment.
#Step 3: Read distance, bearing, and ETA
With the waypoints set, each leg gives you a distance in nautical miles and a bearing to steer in degrees. Add the legs for the total distance. Divide the total distance by your planned speed in knots to get the time underway, and apply that to your departure time for an ETA at each waypoint and the destination.
#Step 4: Estimate fuel
If you are under power, estimate fuel by multiplying your hourly burn rate by the hours underway from the step above. Build in a reserve, since real conditions rarely match the flat-water estimate. A route planner that knows your boat's speed and burn does this for you, but the arithmetic is simple enough to sanity-check by hand.
#Step 5: Check hazards, weather, and tide
A route that looks fine on the plan can still be wrong on the day. Check each leg against the chart for depth and dangers, then look at the weather and, in tidal waters, the tide and current for your planned time. Wind on the nose, a foul tide, or a shoal you missed can all change the plan. This is the difference between a line on a chart and a passage you can safely make.
The same route can be easy or dangerous depending on when you run it. In tidal waters especially, leaving an hour earlier or later to carry a fair tide, or to cross a bar at the right state, often matters more than the exact course. Always plan the departure time, not just the route.
#Step 6: Save, export, and follow the route
Once the route is right, save it so you can follow it and reuse it. Most apps let you export the route as a GPX file, the standard format that loads into chartplotters and other tools, so your plan is not trapped in one place. Underway, monitor your progress against the route and adjust for what the day actually gives you.
Marine OS is marina management software, and we are building a route planner for boaters. Every route ends at a dock, and marinas that take online bookings make that arrival simple, which is the part of boating Marine OS works on.
#The last waypoint is a berth
When you plan the route, plan where you will tie up too. Marinas offering online slip reservations let you secure a berth before you arrive. For tools, see the best marine route planner apps; for the fuller method, the passage planning guide.
Find a route planner that fits your boating
The steps are the same everywhere, but the right app makes them faster. Our comparison walks through the options for your waters and budget.
#Frequently asked questions
Frequently asked questions
Follow the six steps, check the timing, and book your berth ahead. For tools, compare the best route planner apps; for depth, read the passage planning guide.
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