Zygor's Guide also supports TomTom but TomTom is even more unreliable than Cartographer_Waypoints.
The Zygor developers wrote the following yesterday:
The guide can handle TomTom, but TomTom has many known issues in it's programming that cause it to be less reliable than Cartographer which is why we don't guarantee full compatibility with it.
(This is a quote from http://www.zygorguides.com/forum/showthread.php?t=1013 .)
As a result, and to underline my previous post, I (and all Zygor users as well) really hope that Cartographer_Waypoints R2290 (v2.3.6a) is not going to be the last version...