Standard Time; is it just me that had it wrong?

Hello

I'm new to this forum but I hope someone can help. The following question is from yachtmaster coastal it has me stumped. I dont have any problems understanding UTC or a locatios offset to UTC etc. But I'm not sure what they after here. I'm familiar with ISO 8601, but again...help

"How are maritime time zones designated using the ISO standard?"

Cheers
Martin
Australia
 
Basically all as given already: time zones are designated by a letter from A-Z, and each is also allocated a number which is the difference between local time and UT. ISO reckons that eg France which is 1 hour ahead of UT is designated as UT+1, whilst the maritime version shows it as time zone UT-0100.

One tells you what you add to UT to get local time the other what you apply to local time to get UT.

Perfectly simple, it's just done to confuse the enemy.
 
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