Add FAQ item of missing logs to user manual

[Dirk Hohndel: added corresponding entry to the FAQ]

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/Documentation/user-manual.txt b/Documentation/user-manual.txt
index 014d263a2..815bb9b2a 100644
--- a/Documentation/user-manual.txt
+++ b/Documentation/user-manual.txt
@@ -4117,3 +4117,23 @@ It's even more noticeable if you do things like divemastering the initial OW div
 you may stay in the water for a long time, but spend most of it at the surface. And then
 you don't want that to count as some kind of long dive”.
 
+=== Some dive profiles are missing from the download
+
+[[DC_HISTORY]]
+'Question': I cannot download all my dives, only the most recent ones
+even though my dive computer's manual states that it records history of
+e.g. 999 dives.
+
+'Answer': Dive history is different than the dive profiles on the log.
+The history only keeps track of the total number of dives and total
+amount of time spent below surface. The logs, on the other hand, store
+the dive profile, but they have limited amount of memory to do so. The
+exact amount of dive profiles that can be stored on the device depend on
+sample interval and duration of the dives. Once the memory is full the
+oldest dives get overwritten with new dives. Thus we are only able to
+download the last 13, 30 or 199 dives.
+
+If you have downloaded your dives to different dive logging software
+before they were overwritten, there is a high change that Subsurface can
+import these. However, if the logs are only on your dive computer, they
+cannot be salvaged after being over written by new dives.