A chartplotter is one of the most powerful tools on your boat — and one of the most underused. Many boaters turn it on, glance at the map, and call it good. But modern chartplotters can do so much more. Here's how to actually get the most out of yours.
Understand Your Chart Layers
Most chartplotters let you toggle between different chart types: raster (photographic copies of paper charts) and vector (smart digital charts with data layers). Vector charts are generally more useful — they show depth contours, hazards, marinas, and anchorages as separate layers you can turn on or off. Get familiar with what each layer shows and when to use it.
Set Up Depth Shading
One of the most practical features on a chartplotter is depth shading — coloring the water based on depth thresholds you define. Set your shallow-water alarm and shade anything under your vessel's draft in red. You'll see dangerous shallows at a glance before they become a problem. This alone is worth the price of a good unit.
Use Waypoints Strategically
A waypoint is simply a saved GPS position. Use them to mark your favorite anchorages, fuel docks, fishing spots, tricky channel entrances, and hazards. Build up a library of waypoints over time and your chartplotter becomes a personal cruising guide. Name them clearly so they make sense months later.
Create Routes, Not Just Destinations
Instead of navigating point-to-point, build multi-leg routes through your chartplotter. A route strings together multiple waypoints in sequence — so you can plan an entire day trip, including channel turns and danger avoidances, in advance. Review your route before you leave the dock, especially in unfamiliar waters.
Use the MOB Button — And Know Where It Is
As we covered in our man overboard post, the MOB (Man Overboard) button on your chartplotter instantly saves your current GPS position. Find it now, before you ever need it. Some units have it as a dedicated physical button; others require a menu tap. Either way — know it cold.
Sync with VHF and AIS
Many modern chartplotters can integrate with your VHF radio and AIS receiver to display other vessels' positions directly on your chart. This is hugely valuable in busy shipping channels or low-visibility conditions. If your unit supports NMEA 2000 or NMEA 0183 connectivity, take the time to set it up properly.
Keep Your Charts Updated
Channels shift, new hazards appear, and marina depths change. Outdated charts can literally run you aground. Most manufacturers offer annual chart subscriptions or free updates — check your chartplotter's update process and make it part of your seasonal maintenance routine.
A chartplotter is only as smart as the person using it. Spend an hour with the manual (or a YouTube walkthrough of your specific model) and you'll unlock features you didn't know existed. Your future self — navigating a tricky inlet at dusk — will thank you. 🗺️📱