The anchors tag is mostly rock-climbing questions, but with a few boating and snow anchor questions mixed in. There's also the setting-up-an-anchor tag that's not used much.
I'd suggest retiring the anchors tag since it's ambiguous and using more specific tags instead, such as climbing-anchors, boat-anchors, snow-anchors, etc. The setting-up-an-anchor questions could be migrated to climbing-anchors.
I think this would do much to clear potential tag confusion on these items.
The problem with this is unwanted tag fragmentation. The reason why umbrella tags are a good thing (especially as we are talking about very few questions here) are described in this answer:
https://outdoors.meta.stackexchange.com/a/800/3602
E.g. some of these questions are not specific to climbing, but mountaineering in general. The link to the specific activity is already given by tagging something with anchor and climbing or boats...
So if you feel the need to retag with specific tag, please leave the general tag anchor in place as well.
