Several educational mapping techniques include mind mapping, concept mapping, knowledge mapping and competence mapping. This research used pedagogically informed competence maps featuring subject matter and learner capabilities. Mytelemap, a prototype tool, helps learners structure and visualise competence maps and provides study links based on map nodes. An experiment compared learning gains using Mytelemap with the general-purpose tool MindMeister across four web technology topics (HTML, CSS, CSS box model, WordPress) and two levels of Merrill's cognitive taxonomy (recall, use/apply). Results showed significantly higher learning gains with Mytelemap across all topics and taxonomic levels. Learners felt positively about competence mapping and preferred Mytelemap. In contrast, MindMeister showed only modest to negligible learning gains, highlighting the value of Mytelemap's link generation based on node keywords.