An Air Carrier crew reported that the L451 airway waypoint OLDEY is listed at the top of Latin America Chart 7 after LETON but Latin America Chart 5 indicates two additional waypoints on L451 before OLDEY after LETON.
Synopsis
An Air Carrier crew reported that the L451 airway waypoint OLDEY is listed at the top of Latin America Chart 7 after LETON but Latin America Chart 5 indicates two additional waypoints on L451 before OLDEY after LETON.
Narrative
While enroute; we received a re-route clearance due to airway closures; because of severe weather in the Caribbean Area. The revised routing was to proceed to fix 'LETON' and then Airway L451 to 'OLDEY'. We were immediately busy in the cockpit trying to facilitate this re-route and getting the appropriate enroute chart to verify the waypoints. Our NAV system does not have an Airway Data Base; requiring us to manually enter each waypoint of the route. When I initially reviewed the enroute chart we [were] using; I saw the waypoint 'OLDEY' at the very top of the chart (in the border margin) and made the assumption that this was our next enroute fix on airway L451; before getting out the next adjoining enroute chart. But what I did not immediately notice (due to the low light in the cockpit) was that to the left of the depicted fix 'OLDEY' was also printed the fix 'ILIDO'. It was very deceiving and easy to miss; and I did not notice my error in time to notice that the fix prior to OLDEY should have been ILIDO. ATC contacted us approximately 10 minutes after our re-route and inquired about our current LAT/LONG position. We were off-shore; and normal position reporting was in progress; I believe because we were not yet in a radar environment. ATC then cleared us direct to ILIDO; which represented an approximate 5 degree heading change. I am not certain how far we were actually displaced from the airway. Note: The Commercial Chart's Latin America 7/8 enroute chart; which depicts the fixes OLDEY and ILIDO on its northern most chart border can be very misleading. The fix ILIDO which represents the continuation of Airway L451 is not well defined on that section of the chart; and my error during our expedient attempt to comply with our re-route; was in not having the next overlapping enroute chart readily available; which would have prevented this error. In the future; I will not accept a full re-route clearance or enter en route waypoints into our NAV system; before being certain of entering the correct fixes that define the route.
Second reporter narrative
Contributing factors were busy cockpit and time restraint; deviating visually around towering cumulus buildups and thunderstorms; at night with low lighting in the cockpit; mistakenly reading OLDEY on Latin America 7/8 chart as next waypoint after LETON. [This was] discovered by ATC about 10 minutes after reporting position LETON questioning our next stated waypoint as we had said OLDEY after LETON. Corrective actions cleared by ATC direct ILIDO (about a 5 degree heading change). Then looking closer at Latin America 5/6 chart programmed additional waypoints ILIDO and JAINS then OLDEY. To prevent this occurrence again suggest deleting OLDEY (as you will see in large print) on Latin America 7/8 chart and replacing [it] with ILIDO which is the next waypoint. Initial eye contact misleads direct OLDEY after LETON on Airway L451.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.