If you're thinking the download option may suit you, the following information
will help you understand the process and options.
Pricing of NSW maps from the Digital Map Shop
|NSW Topo maps ||for use on one Mobile Device only ||US $65.00 |
|NSW Topo maps ||for use on 2 x PCs and 2 x Mobile Devices ||US $130.00 |
|UBD Street Maps for NSW ||for use on 2 x PCs and 2 x Mobile Devices ||US $18.00 |
What's the real difference? - It comes down to the hassle factor. The download option offers some savings but requires some time, effort and a little knowhow on your part. Whereas the DVD has all the components built in and is ready to use within minutes of placing the disk in the drive. I guess it depends how you value your time.
There is a time limited free demo period on both the software and maps so you can try out the download option and see if this is the way you want to go before you buy anything.
Use only on iPhone/iPad - If you only want to use the maps on a Mobile Device, then the download option is the way to go. You first need to get the Memory-Map app from the AppStore onto the device (you can use the free app), then you can access the Digital Map Shop through the app and select the maps you want to download. Tip - first download the Aus Base Map and sections of the Topo250 map (free maps) before you try to download the detailed 25k Topo maps.
Important - The mobile app is optimised for 3G so it doesn't let you download Gigabytes of map data accidently. By default, it only downloads sections of the map you have framed on screen. To get larger sections, use the bulk download feature accessible from the map list. It's important to download the sections of the map you want before going offline.
When you come to purchase the maps (via a mobile device), you'll have a choice of buying a licence to use the maps on one Mobile Device or 2 PCs and 2 Mobile Devices (that you own). This is the decision point. It doesn't matter that you haven't loaded the maps to a PC yet, if you chose the 2 + 2 option, it means that you have that option ready for a later time. Upgrades are not available.
BTW, if (when) you change your PC or Mobile Device, you can migrate the licences from the old to the new and simply reload/download the maps again.