Most chart apps draw a straight line and leave the consequences to you. Helm plans the passage against your draft, tells you where it gets thin, and shows you when the water will be calmest before you commit to a departure.
Enter your draft once. The router treats water you cannot cross as blocked rather than as a suggestion, so the line it draws is one your boat can take. The summary reports the shallowest point on the route up front — not buried three taps deep.
The departure planner scores the next day and shows the calm windows as a simple bar. You see at a glance that the passage is comfortable from late afternoon to mid-morning and rough after that, so you leave on the right tide instead of the convenient one.
Helm explains its own plan. Rather than a mystery line, you get the legs, the course changes, and the reason a leg goes the way it does. If the router avoided something, you can see what.
Drop and edit waypoints directly on the chart, save fishing spots and anchorages, set a home port, and annotate the chart with your own drawings. Everything syncs across your devices, so a route planned on an iPad is on the phone at the dock.
Routing is planning assistance. It does not know about a log in the channel, a shifted bar or a closed bridge. Keep a lookout and verify locally.
Yes, Helm imports GPX, so routes and tracks from another app or a chartplotter come across.
Yes. Once the chart pack for the area is downloaded, planning and navigation work without a signal.
Yes. Inland depth comes from state elevation surveys, so the router has something to work with away from the coast.
Helm Boating