I found very interesting this possibility, but noted that the problem of the limit of installed subscriptions happens with different GPS devices with the same GTM25 cable, which apparently indicates that signatures are in gtm25 receiver, unless there is some logical problem with my cable.
Giomen when you researched the 41 region, you could tell which GTM cable you used? I ask because I have read in this forum that older models of cables, such as the GTM 10, 12.. and older, do not stored the subscription on the cable, so just might be in some region of the gps memory.
You have as check or, if it's not too much to ask, indicate approximately the offset that they were?
Bookmarks