Gerry:
I'm not really that familiar with the GPS V capabilities, I never used one.
The SP 26xx will save the track you have generated as you travel along, it eventually over-writes itself but not for quite a while. I think the SP 26xx has a lot more memory for track log purposes than the GPS V or SP III, but I am not 100% sure on this.
If you have a special desire to save a certain track, you can go to the "Track" setup page in the "Options" menu, clear the track memory, then do your riding, and when you have finished tracking the area of interest to you, you can turn off the track recording feature. This will ensure that the track you are interested in is not overwritten.
The RMI (Radio Magnetic Indicator) like device on the BMW Motorcycle Navigator II is a special software feature that is only provided on the BMW Motorcycle Navigator. As we all know

the BMW Motorcycle Navigator is not simply a re-labelled SP 2610 being sold for a higher price, it is a "unique BMW product". Now, if the software dudes were to allow the normal SP 26xx to have that feature, my previous sentence would be an untruth, right? (cough, cough). So, no hope we will get it on the "Garmin" brand SP 26xx products. I think there might be a few more tricks coming down the line within the BMW product, but that's about as much as I can say.
FYI, the bearing pointer on the BMW motorcycle navigator points to the direction of your next turn, not to the direction of your destination. So, in theory, all you have to do is just follow that arrow, and you will get to where you want to go. The screen is nicely split so that the RMI shows up on the left side, and the text prompts for turns, etc. show up on the right. When no turn is due for a while, the right side is filled with other info such as speed, time to destination, etc. It works quite nicely. You access it through the "Page" button - the normal SP 26xx has 3 pages, the BMW Motorcycle Navigator II has 4 pages, the 4th one being the RMI. The letters for the compass points (N, NE, E, SE, etc.) always remain upright (right side up) as the compass card swings around. This is a very nice feature, but disconcerting to riders who have an aviation background and are used to seeing the reciprocal heading 'upside down' at the bottom. The card turns very smoothly and is well dampened. You can really see the difference in processing power (screen redraw speed) between the SP 26xx series and the SP III when viewing this particular page.
PanEuropean