VENDOR LIST

Expedition: expedition marine.com; from $1,300

Fastseas: fastseas.com; free for basic service, $60 per year for premium service

Navionics: navionics.com; free trial, then from $15 per year

Predictwind: predictwind .com; from $250 per year for weather-routing service

Timezero: mytimezero .com; from $500