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Appendix
User Defined Fleet Maps
Type I Programming Information 
When a Type I system is designed, the address informa-
tion for all the ID’s is divided into 8 equal sized blocks, 
numbered 0–7. When you program your scanner to track 
a Type I system, you must select a size code for each of 
these blocks. When you have assigned a size code to all 
8 blocks, you’ll have defined the fleet map for the system 
you are tracking. Each size code determines the number 
of fleets, subfleets, and ID’s each block will have. For 
example, a size code of S-4 has one fleet, which is 
divided into 16 separate subfleets, and it has a total of 
512 individual ID’s. 
When a block is assigned a size code, the fleet or fleets 
created within the block are assigned a Type I ID. The 
way these ID’s display on your scanner depend on the 
block number and the block’s size code. When a Type I 
ID appears, the leftmost digit represents the block which 
contains the ID. 
The next three digits identify which fleet is active, and the 
last digit(s) identifies the subfleet. 
The details concerning how the size codes are selected 
by a Type I System designer are highly dependent on the 
specific needs of the system’s users. Some organizations 
might want many subfleets with only a few radios each, 
while another organization might want only a few sub-
fleets with many radios each. Your task is to program your 
fleet map with the same size code assignments as the 
trunked system. If you do this accurately, you’ll track all 
the Fleet-Subfleet combinations used by the system. In 
other words, you’ll hear complete communications while 
monitoring a trunked system. 
If you don’t already know the size codes used, you’ll have 
to guess at them. But since you don’t have to figure out all 
the blocks at once, this isn’t as hard as it seems. Select a 
size code for a block, and then press Scan. Now listen to 
the communications. If you decide you are receiving most