The original poster asked about iPads or PCs like a Surface. I guess it means he is looking at tablets. The most important aspect of navigating on any kind of tablet is the ability to get the
GPS signal. That was what made the iPads so amazing when they first arrived on the scene with real
GPS inside, but always only if you had bought the GPS+cellular version.
The programs he asked about like Predict
Wind and
Navionics are available for Mac, Windows, iOS and Android. But to really make use of them, the machine has to have access to a GPS signal.
The Surface line doesn't have internal GPS, but there are various ways you can add GPS via a USB GPS receiver, or an Android tablet can add a Bad Elf bluetooth GPS, etc. if it doesn't have built-in GPS. But it is something to think about.
We like the fact that our phones and iPads do serve as back-ups for the ship's
navigation system, so that if our GPS goes out in other devices, we still have multiple methods to navigate.
I'm happy that we are building a
new boat that will be totally PC-based, with no chart plotters, but sad that our choice of
software, TimeZero, is not available for the Mac OS. I've been a Mac user from the beginning. The years that I had to deal with Windows machines at
work are not fondly remembered. But the TimeZero navigation
software is amazing, and there is an iOS version of sorts.
And while there is no OpenCPm for iOS, there is
iNavX. It does get pricey with all the
charts, but it also has many features
Navionics does not. And if you are headed out to places where the
charts are sketchy like the
South Pacific, Ovital Maps lets you use downloaded
Google Maps
satellite charts which can tell you if the charts you have are very accurate and the
satellite photos often show the
reefs much better.
Good luck!