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SWELLSIGNAL

LINEUP

Where the wake reaches you

GPS —

Ship positions are 2–5 minutes old. Ferries are live. Boats without AIS never show.

BEFORE YOU GO OUT

LINEUP is Pro. Alerts tier and up.

Swell Signal Pro is sold in the iOS app. Subscribe there, then sign in here with the same account.

PLANS GET THE APP

YOUR PLAN

Hold course: the maths runs your course line at this speed.

Adds 50 m to your boat in every keep-out test.