diff --git a/src/components/tideGraph/graphDataGenerator.ts b/src/components/tideGraph/graphDataGenerator.ts
new file mode 100644
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+++ b/src/components/tideGraph/graphDataGenerator.ts
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+/**
+ * Calculates a tidal curve for a given location
+ * According to "TIME & HEIGHT DIFFERENCES FOR PREDICTING THE TIDE AT SECONDARY PORTS" (https://assets.admiralty.co.uk/public/2022-04/5609%202022%20Feb.pdf)
+ * For Milford Haven:
+ * MHWS  7.0
+ * MHWN  5.2
+ * MLWN  2.5
+ * MLWS  0.7
+ * Midpoint therefore 3.85 (calculated as average of MHWS-((MHWS-MLWS)/2) & MHWN-((MHWN-MLWN)/2) )
+ * 
+ * For Criccieth:
+ * MHWS  -2   5.0
+ * MHWN  -1.8 3.4
+ * MLWN  -0.7 1.8
+ * MLWS  -0.3 0.4
+ * Midpoint therefore = 2.65
+ * 
+ * For Porthmadog:
+ * MHWS  -1.9 5.1
+ * MHWN  -1.8 3.4
+ * MLWN  ??? so we assume 1.8
+ * MLWS  ??? so we assume 0.3
+ * Midpoint therefore assumed = 2.65
+ * 
+ * Using the midpoint we can derive the lowest height for a given time and high tide to be MIDPOINT - (HEIGHT - MIDPOINT)
+ * 
+ * This isn't very acurate because of the river Glaslyn, so the admiralty do not therefore publish tidal curves for this location, or low tide times - we have just derived them from their data
+ *  
+ */
+import { TidesJson_ScheduleObject } from "../../types";
+// According to "TIME & HEIGHT DIFFERENCES FOR PREDICTING THE TIDE AT SECONDARY PORTS"
+const generateTideGraphData = (tideData: Array<{ date: Date, height: number }>): Array<{ timestamp: number, height: number }> => {
+  return []
+}