"butaglo" wrote in message . au...
Problem is that I upgraded my Cmap for larger area and now it will not work
on my GPS Humminbird NP25.
It works on a friends Navman 5500i strangely and is ok when checked by the
supplier.
His older equivalent chip works on my Humminbird but not my equivalent but
newer Cmap which is meant to be
identical.

Any body aware of why this should happen ???

Some versions of the Humminbird operating software may not reconize
an NT+
C-card when it is installed in the unit. Humminbird introduced new
operating software to correct this problem. You should contact
Humminbird directly at
1.334.687.6613 to make arrangements to update your NS-25.

Jim McQuade
C-MAP/USA