internal link

Author: j-atkins

docs/user-guide/assignments/Research_proposal_intro.ipynb

@@ -99,7 +99,7 @@
     "\n",
     "<!-- TODO: this note can be removed when CTD and CTD_BGC are combined to one instrument -->\n",
     "<div class=\"alert alert-block alert-info\"> \n",
-    "**Note**: If you are deploying CTDs in both standard and biogeochemical configurations (`CTD` and `CTD_BGC`), you only need to factor in the 50 minutes **once** per waypoint, as both can be deployed on the same cast.\n",
+    "**Note**: If you are deploying CTDs in both standard and biogeochemical configurations (`CTD` and `CTD_BGC`) in your [VirtualShip expeditions](./Sail_the_ship.ipynb), you only need to factor in the 50 minutes **once** per waypoint, as both can be deployed on the same cast.\n",
     "</div>\n",
     "\n",
     "<iframe width=\"560\" height=\"315\" src=\"https://www.youtube.com/embed/7N2UsPDczTw\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen></iframe>"