Here's a look at the iPad alongside the Raymarine E-80...

Similar size screen, the iPad is a bit wider. Of course, the E-80 integrates with the radar, autopilot, depth finder, and VHF; no way to do that with the iPad. The iPad runs off its own battery, so is independent of the boat's 12v system. The E-80 is "marinized", i.e. it is made rugged for the marine environment. If there's any spray, I put the iPad in a plastic bag (the touch screen still works through the bag). The E-80 has satellite image overlay and some aerial photos, lots of marina and nav aid info. The iPad 3G will have the charting info even without an internet connection; with a connection, you can overlay Google Earth or Bing. Unlimited info via the internet when connected. From the Apple specs, the wifi only model iPad doesn't have a GPS chip and requires an internet connection to determine position.
Both devices require 3rd party chart info. Using the Navionics Platinum CF chip in the E-80 will cost you around $300 per area. The Navionics app for the iPad is $20 and covers a larger territory. A significant difference if you accumulate chips/apps for different areas. Of course, the iPad app requires that you push the button to accept the fact that the app is an "aid" and should not be used for navigation. Using them side by side, it is pretty apparent that they are taking the same charting info for each. Accuracy seems to be the same. I haven't figured a way to get the iPad app to run with "track up", my preference on the main chartplotter; it runs with "north up."
One big difference: you can sit in the cockpit and surf the net with the iPad... haven't figured out a way to do that with the E-80. :wink:
Would I replace the fixed chartplotter with the iPad? No. While the chartplotter is a "one trick pony," it is a darn fine pony. But, the iPad makes a great, inexpensive (if you consider that you will have lots of other uses for it on the boat: eReader, internet, e-mail, photo storage, contacts, weather radar, etc, etc) back up for the back up chartplotter. And did I mention: $20 apps for different coverages??
Oh, and for those of you who want a compass for back up, there's an app for that. 8)
My old 176c Garmin has been my back up chartplotter since we got this boat. The connection for the 12v cord died this summer and I was thinking about replacing that with something similar in size. Considering what the 176 cost back when I bought it (about 8 years ago), the iPad is a much better deal. Even if you don't spring for the $20 Navionics apps, the built-in Google Maps app will keep track of your position; of course, that doesn't give you nav aids and all the stuff you get on the Navionics app.
Just putting this out there for discussion sake.
Best wishes,
Jim B.

Similar size screen, the iPad is a bit wider. Of course, the E-80 integrates with the radar, autopilot, depth finder, and VHF; no way to do that with the iPad. The iPad runs off its own battery, so is independent of the boat's 12v system. The E-80 is "marinized", i.e. it is made rugged for the marine environment. If there's any spray, I put the iPad in a plastic bag (the touch screen still works through the bag). The E-80 has satellite image overlay and some aerial photos, lots of marina and nav aid info. The iPad 3G will have the charting info even without an internet connection; with a connection, you can overlay Google Earth or Bing. Unlimited info via the internet when connected. From the Apple specs, the wifi only model iPad doesn't have a GPS chip and requires an internet connection to determine position.
Both devices require 3rd party chart info. Using the Navionics Platinum CF chip in the E-80 will cost you around $300 per area. The Navionics app for the iPad is $20 and covers a larger territory. A significant difference if you accumulate chips/apps for different areas. Of course, the iPad app requires that you push the button to accept the fact that the app is an "aid" and should not be used for navigation. Using them side by side, it is pretty apparent that they are taking the same charting info for each. Accuracy seems to be the same. I haven't figured a way to get the iPad app to run with "track up", my preference on the main chartplotter; it runs with "north up."
One big difference: you can sit in the cockpit and surf the net with the iPad... haven't figured out a way to do that with the E-80. :wink:
Would I replace the fixed chartplotter with the iPad? No. While the chartplotter is a "one trick pony," it is a darn fine pony. But, the iPad makes a great, inexpensive (if you consider that you will have lots of other uses for it on the boat: eReader, internet, e-mail, photo storage, contacts, weather radar, etc, etc) back up for the back up chartplotter. And did I mention: $20 apps for different coverages??
Oh, and for those of you who want a compass for back up, there's an app for that. 8)
My old 176c Garmin has been my back up chartplotter since we got this boat. The connection for the 12v cord died this summer and I was thinking about replacing that with something similar in size. Considering what the 176 cost back when I bought it (about 8 years ago), the iPad is a much better deal. Even if you don't spring for the $20 Navionics apps, the built-in Google Maps app will keep track of your position; of course, that doesn't give you nav aids and all the stuff you get on the Navionics app.
Just putting this out there for discussion sake.
Best wishes,
Jim B.