According to the help topic, i should be able to merge 2 or more charts to form one.
To merge maps, first open the map that covers the largest part of your area of interest. You can start merging from any map, but the original one will retain slightly better image quality than the ones you merge with it. Move the cursor off the edge of the map in the area of interest, right click and select Merge Map. The popup menu shows a list of maps at similar scale that can be merged. Select one of them, and a the merge process is started. In a few seconds (depending on the size of the map files) the merged result is displayed. You can continue merging other maps to cover your area of interest.
In the Merge Map menu, there is an Anti-alias option. This enhances the quality of the merged result, at the expense of a larger file size. By default this is turned off, to favor small size and performance. If you intend to use the maps on a PDA, we recommend you leave it off. If you are using a high-powered computer and disk space is not a problem, it does give a slightly better-looking result. When Anti-alias is enabled, it is applied whenever you merge a map. It does not affect maps you have already merged.
Unfortunatley i cannot merge more than 2 maps, have i wasted my money buying this or is there something wrong?