The Garmin Map76 is outdated and not supported. But if you have the charts they still work really well. There is a replacement Garmin chartplotter handheld that is also 1)waterproof, 2)shockproof (in other words marinized). We just added the Garmin Map640 which is a marinized version in the Nuvi style. It includes Bluechart for all the US, roadmaps, and has a 6 hour battery. We keep it charging in its cradle at the nav station and bring it on deck for backup. On shore you can use it to navigate to the local restaurants and grocery stores. I consider any laptop, pad, phone, pod to be a toy, too fragile.