Difficult to be certain with out the right gear but
16 TX/RX frequency is same on all 3 settings Int (International) USA (obviously US) and C (Canadian).
make sure set to International then select the weather NOWcastinghttps://www.boprc.govt.nz/living-in-...ther-and-tides
If you cant hear the wearther informtion then you could have a dodgy antenna or the radio could be poo. You could try Burnsco and see if you could try one of there antennas and see if it solves the issue and if so buy it ( you might need to take your boat down for this)
You can test Tx/Rx if you have a mate with a handheld VHF, put both on Low power on Chan 8,9 or 10 and try communicating.
Usually its the antenna that is rooted. We have a RF test set at work for checking VHF itself and SWR meter for testing Antenna and cable however thats no good to you as its not something most service shops have due to cost.
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