Inquire about newfangled copy protections of some new charting softwares not advertised before you buy, which make them risky for many cruisers. Some of these schemes needs a "dongle", a piece of harware to plug-in to your Laptop
, and if it gets damaged or lost
, your are stuck and your investment is gone. Others want you to call-in for registration
, if the software
gets damaged on your hard disk and you want to reinstall it. Calling from oversees or from the middle of the Ccean is not simple, which makes them also high risk investment.