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There is not. I have also requested this feature, or statewide for certain features (HD).
Any sense of how many Gb of storage 14 - 5 mile sections took up on your phone?
A five mile Hi Res offline map will average about 315mb, so a 5x14 should be around a 1 GB. So the answer to your question is a 5x14 would be roughly 8Gb since 1 GigaByte=8 Gigabits.