It would help if you explained carefully:
1. How long these 'long' routes are. Are they for instance, 1000 miles each?
Varying from 150 to 1000 miles. The longer routes have maybe 10 waypoints so they are long but don't have a lot of waypoints, some of the shorter routes can have up to 30 waypoints.
2. Whether you created the routes outside of Mapsource (for instance in Tyre or some such third party software) and only used Mapsource as a base platform to get them into your Nav IV?
Created them in Mapsource.
3. What method are you using to send the routes from Mapsource to the Nav IV?
Sending them from Mapsource either to the memory card or the NAV IV unit, getting the same issue from either method.
3. What length are the routes that you have apparently loaded successfully?
Pretty short, less than 200 miles.
4. Are you sending lots of long routes at once, in one file, or are you sending them each separately?
Yes but loading them one at a time.
5. From memory, the Nav IV has a limit as to how many routes it can hold at any one time. If my memory as to the limitation is correct, have you exceeded this limit?
I think this is 10 but no, only have a couple in there.
6. When in the process does the error message flash up, exactly?
Just counts up the % complete (pretty quickly) then flashes up at the end.
I thought it might be a space issue so I removed my gmapsupp file from the unit and still the same issue.
Ian