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HM Nautical Almanac Office: NavPac 3

Mscomctl.ocx: Error 339

We have been made aware that users of some newer operating systems are unable to run NavPac 3.4 or earlier after installation. Attempting to run NavPac 3.4 or earlier results in an error message: Error 339 with a reference to mscomctl.ocx.

It is therefore recommended that any users encountering this issue should register their copy of NavPac 3.4 and obtain the free upgrade to NavPac 4.0.

There is a guide to assist you in this process available here.

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Last modified: Tuesday, 31 December 2019 at 10:14:21 GMT