...I do a lot of search and rescue work in SNP...
I second BigLebowski's statement.
In which SAR Group are you a member? If you operate in SNP and in particular Skyline Drive, then your group is probably a member of ASRC, and might have mutual aid agreements with the SNP. Most groups are particular about who has radios and who does not, because they have to work across many jurisdictions depending on where the incident takes them, and they have to be accountable to other agencies under mutual aid agreements. If you haven't already done so, you should check with the leader of your SAR group to see if you can get issued an official SAR Team radio. Most agencies will not allow, nor provide the information for, someone to have a personally-owned radio with transmit-option enabled, especially on frequencies for which that agency is not licensed; they might be willing to issue an official radio to that person (just not share the programming knowledge).
Hope this helps,
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